public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
// intersect in local space
float rd2x = r.dx * r.dx;
float rd2y = r.dy * r.dy;
float rd2z = r.dz * r.dz;
float ro2x = r.ox * r.ox;
float ro2y = r.oy * r.oy;
float ro2z = r.oz * r.oz;
// setup the quartic coefficients
// some common terms could probably be shared across these
double A = (rd2y * rd2y + rd2z * rd2z + rd2x * rd2x);
double B = 4 * (r.oy * rd2y * r.dy + r.oz * r.dz * rd2z + r.ox * r.dx * rd2x);
double C = (-rd2x - rd2y - rd2z + 6 * (ro2y * rd2y + ro2z * rd2z + ro2x * rd2x));
double D = 2 * (2 * ro2z * r.oz * r.dz - r.oz * r.dz + 2 * ro2x * r.ox * r.dx + 2 * ro2y * r.oy * r.dy - r.ox * r.dx - r.oy * r.dy);
double E = 3.0f / 8.0f + (-ro2z + ro2z * ro2z - ro2y + ro2y * ro2y - ro2x + ro2x * ro2x);
// solve equation
double[] t = Solvers.solveQuartic(A, B, C, D, E);
if (t != null)
{
// early rejection
if (t[0] >= r.getMax() || t[t.Length - 1] <= r.getMin())
return;
// find first intersection in front of the ray
for (int i = 0; i < t.Length; i++)
{
if (t[i] > r.getMin())
{
r.setMax((float)t[i]);
state.setIntersection(0, 0, 0);
return;
}
}
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
// intersect in local space
float qa = r.dx * r.dx + r.dy * r.dy + r.dz * r.dz;
float qb = 2 * ((r.dx * r.ox) + (r.dy * r.oy) + (r.dz * r.oz));
float qc = ((r.ox * r.ox) + (r.oy * r.oy) + (r.oz * r.oz)) - 1;
double[] t = Solvers.solveQuadric(qa, qb, qc);
if (t != null)
{
// early rejection
if (t[0] >= r.getMax() || t[1] <= r.getMin())
return;
if (t[0] > r.getMin())
r.setMax((float)t[0]);
else
r.setMax((float)t[1]);
state.setIntersection(0, 0, 0);
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
int i3 = primID * 3;
float ocx = r.ox - particles[i3 + 0];
float ocy = r.oy - particles[i3 + 1];
float ocz = r.oz - particles[i3 + 2];
float qa = r.dx * r.dx + r.dy * r.dy + r.dz * r.dz;
float qb = 2 * ((r.dx * ocx) + (r.dy * ocy) + (r.dz * ocz));
float qc = ((ocx * ocx) + (ocy * ocy) + (ocz * ocz)) - r2;
double[] t = Solvers.solveQuadric(qa, qb, qc);
if (t != null)
{
// early rejection
if (t[0] >= r.getMax() || t[1] <= r.getMin())
return;
if (t[0] > r.getMin())
r.setMax((float)t[0]);
else
r.setMax((float)t[1]);
state.setIntersection(primID);
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
float intervalMin = r.getMin();
float intervalMax = r.getMax();
float orgX = r.ox;
float orgY = r.oy;
float orgZ = r.oz;
float dirX = r.dx, invDirX = 1 / dirX;
float dirY = r.dy, invDirY = 1 / dirY;
float dirZ = r.dz, invDirZ = 1 / dirZ;
float t1, t2;
t1 = (-1 - orgX) * invDirX;
t2 = (+1 - orgX) * invDirX;
int curr = -1;
if (invDirX > 0)
{
if (t1 > intervalMin)
{
intervalMin = t1;
curr = 0;
}
if (t2 < intervalMax)
intervalMax = t2;
if (intervalMin > intervalMax)
return;
}
else
{
if (t2 > intervalMin)
{
intervalMin = t2;
curr = 1;
}
if (t1 < intervalMax)
intervalMax = t1;
if (intervalMin > intervalMax)
return;
}
t1 = (-1 - orgY) * invDirY;
t2 = (+1 - orgY) * invDirY;
if (invDirY > 0)
{
if (t1 > intervalMin)
{
intervalMin = t1;
curr = 2;
}
if (t2 < intervalMax)
intervalMax = t2;
if (intervalMin > intervalMax)
return;
}
else
{
if (t2 > intervalMin)
{
intervalMin = t2;
curr = 3;
}
if (t1 < intervalMax)
intervalMax = t1;
if (intervalMin > intervalMax)
return;
}
t1 = (-1 - orgZ) * invDirZ;
t2 = (+1 - orgZ) * invDirZ;
if (invDirZ > 0)
{
if (t1 > intervalMin)
{
intervalMin = t1;
curr = 4;
}
if (t2 < intervalMax)
intervalMax = t2;
if (intervalMin > intervalMax)
return;
}
else
{
if (t2 > intervalMin)
{
intervalMin = t2;
curr = 5;
}
if (t1 < intervalMax)
intervalMax = t1;
if (intervalMin > intervalMax)
return;
}
// box is hit at [intervalMin, intervalMax]
orgX += intervalMin * dirX;
orgY += intervalMin * dirY;
orgZ += intervalMin * dirZ;
// locate starting point inside the grid
// and set up 3D-DDA vars
int indxX, indxY, indxZ;
int stepX, stepY, stepZ;
int stopX, stopY, stopZ;
float deltaX, deltaY, deltaZ;
float tnextX, tnextY, tnextZ;
// stepping factors along X
indxX = (int)((orgX + 1) * invVoxelwx);
if (indxX < 0)
indxX = 0;
else if (indxX >= nx)
indxX = nx - 1;
if (Math.Abs(dirX) < 1e-6f)
{
stepX = 0;
stopX = indxX;
deltaX = 0;
tnextX = float.PositiveInfinity;
}
else if (dirX > 0)
{
stepX = 1;
stopX = nx;
deltaX = voxelwx * invDirX;
tnextX = intervalMin + ((indxX + 1) * voxelwx - 1 - orgX) * invDirX;
}
else
{
stepX = -1;
stopX = -1;
deltaX = -voxelwx * invDirX;
tnextX = intervalMin + (indxX * voxelwx - 1 - orgX) * invDirX;
}
// stepping factors along Y
indxY = (int)((orgY + 1) * invVoxelwy);
if (indxY < 0)
indxY = 0;
else if (indxY >= ny)
indxY = ny - 1;
if (Math.Abs(dirY) < 1e-6f)
{
stepY = 0;
stopY = indxY;
deltaY = 0;
tnextY = float.PositiveInfinity;
}
else if (dirY > 0)
{
stepY = 1;
stopY = ny;
deltaY = voxelwy * invDirY;
tnextY = intervalMin + ((indxY + 1) * voxelwy - 1 - orgY) * invDirY;
}
else
{
stepY = -1;
stopY = -1;
deltaY = -voxelwy * invDirY;
tnextY = intervalMin + (indxY * voxelwy - 1 - orgY) * invDirY;
}
// stepping factors along Z
indxZ = (int)((orgZ + 1) * invVoxelwz);
if (indxZ < 0)
indxZ = 0;
else if (indxZ >= nz)
indxZ = nz - 1;
if (Math.Abs(dirZ) < 1e-6f)
{
stepZ = 0;
stopZ = indxZ;
deltaZ = 0;
tnextZ = float.PositiveInfinity;
}
else if (dirZ > 0)
{
stepZ = 1;
stopZ = nz;
deltaZ = voxelwz * invDirZ;
tnextZ = intervalMin + ((indxZ + 1) * voxelwz - 1 - orgZ) * invDirZ;
}
else
{
stepZ = -1;
stopZ = -1;
deltaZ = -voxelwz * invDirZ;
tnextZ = intervalMin + (indxZ * voxelwz - 1 - orgZ) * invDirZ;
}
// are we starting inside the cube
bool isInside = inside(indxX, indxY, indxZ) && bounds.contains(r.ox, r.oy, r.oz);
// trace through the grid
for (; ; )
{
if (inside(indxX, indxY, indxZ) != isInside)
{
// we hit a boundary
r.setMax(intervalMin);
// if we are inside, the last bit needs to be flipped
if (isInside)
curr ^= 1;
state.setIntersection(curr);
return;
}
if (tnextX < tnextY && tnextX < tnextZ)
{
curr = dirX > 0 ? 0 : 1;
intervalMin = tnextX;
if (intervalMin > intervalMax)
return;
indxX += stepX;
if (indxX == stopX)
return;
tnextX += deltaX;
}
else if (tnextY < tnextZ)
{
curr = dirY > 0 ? 2 : 3;
intervalMin = tnextY;
if (intervalMin > intervalMax)
return;
indxY += stepY;
if (indxY == stopY)
return;
tnextY += deltaY;
}
else
{
curr = dirZ > 0 ? 4 : 5;
intervalMin = tnextZ;
if (intervalMin > intervalMax)
return;
indxZ += stepZ;
if (indxZ == stopZ)
return;
tnextZ += deltaZ;
}
}
}
public void intersect(Ray r, IntersectionState state)
{
float intervalMin = r.getMin();
float intervalMax = r.getMax();
float orgX = r.ox;
float dirX = r.dx, invDirX = 1 / dirX;
float t1, t2;
t1 = (bounds.getMinimum().x - orgX) * invDirX;
t2 = (bounds.getMaximum().x - orgX) * invDirX;
if (invDirX > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgY = r.oy;
float dirY = r.dy, invDirY = 1 / dirY;
t1 = (bounds.getMinimum().y - orgY) * invDirY;
t2 = (bounds.getMaximum().y - orgY) * invDirY;
if (invDirY > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgZ = r.oz;
float dirZ = r.dz, invDirZ = 1 / dirZ;
t1 = (bounds.getMinimum().z - orgZ) * invDirZ;
t2 = (bounds.getMaximum().z - orgZ) * invDirZ;
if (invDirZ > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
// box is hit at [intervalMin, intervalMax]
orgX += intervalMin * dirX;
orgY += intervalMin * dirY;
orgZ += intervalMin * dirZ;
// locate starting point inside the grid
// and set up 3D-DDA vars
int indxX, indxY, indxZ;
int stepX, stepY, stepZ;
int stopX, stopY, stopZ;
float deltaX, deltaY, deltaZ;
float tnextX, tnextY, tnextZ;
// stepping factors along X
indxX = (int)((orgX - bounds.getMinimum().x) * invVoxelwx);
if (indxX < 0)
indxX = 0;
else if (indxX >= nx)
indxX = nx - 1;
if (Math.Abs(dirX) < 1e-6f)
{
stepX = 0;
stopX = indxX;
deltaX = 0;
tnextX = float.PositiveInfinity;
}
else if (dirX > 0)
{
stepX = 1;
stopX = nx;
deltaX = voxelwx * invDirX;
tnextX = intervalMin + ((indxX + 1) * voxelwx + bounds.getMinimum().x - orgX) * invDirX;
}
else
{
stepX = -1;
stopX = -1;
deltaX = -voxelwx * invDirX;
tnextX = intervalMin + (indxX * voxelwx + bounds.getMinimum().x - orgX) * invDirX;
}
// stepping factors along Y
indxY = (int)((orgY - bounds.getMinimum().y) * invVoxelwy);
if (indxY < 0)
indxY = 0;
else if (indxY >= ny)
indxY = ny - 1;
if (Math.Abs(dirY) < 1e-6f)
{
stepY = 0;
stopY = indxY;
deltaY = 0;
tnextY = float.PositiveInfinity;
}
else if (dirY > 0)
{
stepY = 1;
stopY = ny;
deltaY = voxelwy * invDirY;
tnextY = intervalMin + ((indxY + 1) * voxelwy + bounds.getMinimum().y - orgY) * invDirY;
}
else
{
stepY = -1;
stopY = -1;
deltaY = -voxelwy * invDirY;
tnextY = intervalMin + (indxY * voxelwy + bounds.getMinimum().y - orgY) * invDirY;
}
// stepping factors along Z
indxZ = (int)((orgZ - bounds.getMinimum().z) * invVoxelwz);
if (indxZ < 0)
indxZ = 0;
else if (indxZ >= nz)
indxZ = nz - 1;
if (Math.Abs(dirZ) < 1e-6f)
{
stepZ = 0;
stopZ = indxZ;
deltaZ = 0;
tnextZ = float.PositiveInfinity;
}
else if (dirZ > 0)
{
stepZ = 1;
stopZ = nz;
deltaZ = voxelwz * invDirZ;
tnextZ = intervalMin + ((indxZ + 1) * voxelwz + bounds.getMinimum().z - orgZ) * invDirZ;
}
else
{
stepZ = -1;
stopZ = -1;
deltaZ = -voxelwz * invDirZ;
tnextZ = intervalMin + (indxZ * voxelwz + bounds.getMinimum().z - orgZ) * invDirZ;
}
int cellstepX = stepX;
int cellstepY = stepY * nx;
int cellstepZ = stepZ * ny * nx;
int cell = indxX + indxY * nx + indxZ * ny * nx;
// trace through the grid
for (; ; )
{
if (tnextX < tnextY && tnextX < tnextZ)
{
if (cells[cell] != null)
{
foreach (int i in cells[cell])
primitives.intersectPrimitive(r, i, state);
if (state.hit() && (r.getMax() < tnextX && r.getMax() < intervalMax))
return;
}
intervalMin = tnextX;
if (intervalMin > intervalMax)
return;
indxX += stepX;
if (indxX == stopX)
return;
tnextX += deltaX;
cell += cellstepX;
}
else if (tnextY < tnextZ)
{
if (cells[cell] != null)
{
foreach (int i in cells[cell])
primitives.intersectPrimitive(r, i, state);
if (state.hit() && (r.getMax() < tnextY && r.getMax() < intervalMax))
return;
}
intervalMin = tnextY;
if (intervalMin > intervalMax)
return;
indxY += stepY;
if (indxY == stopY)
return;
tnextY += deltaY;
cell += cellstepY;
}
else
{
if (cells[cell] != null)
{
foreach (int i in cells[cell])
primitives.intersectPrimitive(r, i, state);
if (state.hit() && (r.getMax() < tnextZ && r.getMax() < intervalMax))
return;
}
intervalMin = tnextZ;
if (intervalMin > intervalMax)
return;
indxZ += stepZ;
if (indxZ == stopZ)
return;
tnextZ += deltaZ;
cell += cellstepZ;
}
}
}
public void intersect(Ray r, IntersectionState state)
{
float intervalMin = r.getMin();
float intervalMax = r.getMax();
float orgX = r.ox;
float dirX = r.dx, invDirX = 1 / dirX;
float t1, t2;
t1 = (bounds.getMinimum ().x - orgX) * invDirX;
t2 = (bounds.getMaximum ().x - orgX) * invDirX;
if (invDirX > 0) {
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
} else {
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgY = r.oy;
float dirY = r.dy, invDirY = 1 / dirY;
t1 = (bounds.getMinimum ().y - orgY) * invDirY;
t2 = (bounds.getMaximum ().y - orgY) * invDirY;
if (invDirY > 0) {
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
} else {
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgZ = r.oz;
float dirZ = r.dz, invDirZ = 1 / dirZ;
t1 = (bounds.getMinimum ().z - orgZ) * invDirZ;
t2 = (bounds.getMaximum ().z - orgZ) * invDirZ;
if (invDirZ > 0) {
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
} else {
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
// compute custom offsets from direction sign bit
int offsetXFront = (int)((uint)(ByteUtil.floatToRawIntBits (dirX) & (1 << 31)) >> 30);//>>>
int offsetYFront = (int)((uint)(ByteUtil.floatToRawIntBits (dirY) & (1 << 31)) >> 30);//>>>
int offsetZFront = (int)((uint)(ByteUtil.floatToRawIntBits (dirZ) & (1 << 31)) >> 30);//>>>
int offsetXBack = offsetXFront ^ 2;
int offsetYBack = offsetYFront ^ 2;
int offsetZBack = offsetZFront ^ 2;
IntersectionState.StackNode[] stack = state.getStack ();
int stackPos = 0;
int node = 0;
while (true) {
int tn = tree [node];
int axis = tn & (3 << 30);
int offset = tn & ~(3 << 30);
switch (axis) {
case 0:
{
float d = (ByteUtil.intBitsToFloat (tree [node + 1]) - orgX) * invDirX;
int back = offset + offsetXBack;
node = back;
if (d < intervalMin)
continue;
node = offset + offsetXFront; // front
if (d > intervalMax)
continue;
// push back node
stack [stackPos].node = back;
stack [stackPos].near = (d >= intervalMin) ? d : intervalMin;
stack [stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (d <= intervalMax) ? d : intervalMax;
continue;
}
case 1 << 30:
{
// y axis
float d = (ByteUtil.intBitsToFloat (tree [node + 1]) - orgY) * invDirY;
int back = offset + offsetYBack;
node = back;
if (d < intervalMin)
continue;
node = offset + offsetYFront; // front
if (d > intervalMax)
continue;
// push back node
stack [stackPos].node = back;
stack [stackPos].near = (d >= intervalMin) ? d : intervalMin;
stack [stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (d <= intervalMax) ? d : intervalMax;
continue;
}
case 2 << 30:
{
// z axis
float d = (ByteUtil.intBitsToFloat (tree [node + 1]) - orgZ) * invDirZ;
int back = offset + offsetZBack;
node = back;
if (d < intervalMin)
continue;
node = offset + offsetZFront; // front
if (d > intervalMax)
continue;
// push back node
stack [stackPos].node = back;
stack [stackPos].near = (d >= intervalMin) ? d : intervalMin;
stack [stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (d <= intervalMax) ? d : intervalMax;
continue;
}
default:
{
// leaf - test some objects
int n = tree [node + 1];
while (n > 0) {
primitiveList.intersectPrimitive (r, primitives [offset], state);
n--;
offset++;
}
if (r.getMax () < intervalMax)
return;
do {
// stack is empty?
if (stackPos == 0)
return;
// move back up the stack
stackPos--;
intervalMin = stack [stackPos].near;
if (r.getMax () < intervalMin)
continue;
node = stack [stackPos].node;
intervalMax = stack [stackPos].far;
break;
} while (true);
break;
}
} // switch
} // traversal loop
}
public void intersectPrimitiveRobust(Ray r, int primID, IntersectionState state)
{
// ray-triangle intersection here
int tri = 3 * primID;
int a = 3 * triangles[tri + 0];
int b = 3 * triangles[tri + 1];
int c = 3 * triangles[tri + 2];
float[] stack = state.getRobustStack();
for (int i = 0, i3 = 0; i < 3; i++, i3 += 3)
{
stack[i3 + 0] = points[a + i];
stack[i3 + 1] = points[b + i];
stack[i3 + 2] = points[c + i];
}
stack[9] = float.PositiveInfinity;
int stackpos = 0;
float orgX = r.ox;
float dirX = r.dx, invDirX = 1 / dirX;
float orgY = r.oy;
float dirY = r.dy, invDirY = 1 / dirY;
float orgZ = r.oz;
float dirZ = r.dz, invDirZ = 1 / dirZ;
float t1, t2;
float minx, maxx;
float miny, maxy;
float minz, maxz;
float mint = r.getMin();
float maxt = r.getMax();
while (stackpos >= 0)
{
float intervalMin = mint;
float intervalMax = maxt;
float p0x = stack[stackpos + 0];
float p1x = stack[stackpos + 1];
float p2x = stack[stackpos + 2];
t1 = ((minx = MathUtils.min(p0x, p1x, p2x)) - orgX) * invDirX;
t2 = ((maxx = MathUtils.max(p0x, p1x, p2x)) - orgX) * invDirX;
if (invDirX > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= 10;
continue;
}
float p0y = stack[stackpos + 3];
float p1y = stack[stackpos + 4];
float p2y = stack[stackpos + 5];
t1 = ((miny = MathUtils.min(p0y, p1y, p2y)) - orgY) * invDirY;
t2 = ((maxy = MathUtils.max(p0y, p1y, p2y)) - orgY) * invDirY;
if (invDirY > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= 10;
continue;
}
float p0z = stack[stackpos + 6];
float p1z = stack[stackpos + 7];
float p2z = stack[stackpos + 8];
t1 = ((minz = MathUtils.min(p0z, p1z, p2z)) - orgZ) * invDirZ;
t2 = ((maxz = MathUtils.max(p0z, p1z, p2z)) - orgZ) * invDirZ;
if (invDirZ > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= 10;
continue;
}
// intersection was found - keep going
float size = (maxx - minx) + (maxy - miny) + (maxz - minz);
if (ByteUtil.floatToRawIntBits(stack[stackpos + 9]) == ByteUtil.floatToRawIntBits(size))
{
// L1 norm is 0, we are done
r.setMax(intervalMin);
triaccel[primID].intersectBox(r, p0x, p0y, p0z, primID, state);
return; // safe to return, only one intersection per primitive
}
// not small enough yet - subdivide
float p01x = (p0x + p1x) * 0.5f;
float p01y = (p0y + p1y) * 0.5f;
float p01z = (p0z + p1z) * 0.5f;
float p12x = (p1x + p2x) * 0.5f;
float p12y = (p1y + p2y) * 0.5f;
float p12z = (p1z + p2z) * 0.5f;
float p20x = (p2x + p0x) * 0.5f;
float p20y = (p2y + p0y) * 0.5f;
float p20z = (p2z + p0z) * 0.5f;
// triangle 0
stack[stackpos + 0] = p0x;
stack[stackpos + 1] = p01x;
stack[stackpos + 2] = p20x;
stack[stackpos + 3] = p0y;
stack[stackpos + 4] = p01y;
stack[stackpos + 5] = p20y;
stack[stackpos + 6] = p0z;
stack[stackpos + 7] = p01z;
stack[stackpos + 8] = p20z;
stack[stackpos + 9] = size;
stackpos += 10;
// triangle 1
stack[stackpos + 0] = p1x;
stack[stackpos + 1] = p12x;
stack[stackpos + 2] = p01x;
stack[stackpos + 3] = p1y;
stack[stackpos + 4] = p12y;
stack[stackpos + 5] = p01y;
stack[stackpos + 6] = p1z;
stack[stackpos + 7] = p12z;
stack[stackpos + 8] = p01z;
stack[stackpos + 9] = size;
stackpos += 10;
// triangle 2
stack[stackpos + 0] = p2x;
stack[stackpos + 1] = p20x;
stack[stackpos + 2] = p12x;
stack[stackpos + 3] = p2y;
stack[stackpos + 4] = p20y;
stack[stackpos + 5] = p12y;
stack[stackpos + 6] = p2z;
stack[stackpos + 7] = p20z;
stack[stackpos + 8] = p12z;
stack[stackpos + 9] = size;
stackpos += 10;
// triangle 4
stack[stackpos + 0] = p20x;
stack[stackpos + 1] = p12x;
stack[stackpos + 2] = p01x;
stack[stackpos + 3] = p20y;
stack[stackpos + 4] = p12y;
stack[stackpos + 5] = p01y;
stack[stackpos + 6] = p20z;
stack[stackpos + 7] = p12z;
stack[stackpos + 8] = p01z;
stack[stackpos + 9] = size;
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
// intersect with bounding sphere
float qc = ((r.ox * r.ox) + (r.oy * r.oy) + (r.oz * r.oz)) - BOUNDING_RADIUS2;
float qt = r.getMin();
if (qc > 0)
{
// we are starting outside the sphere, find intersection on the
// sphere
float qa = r.dx * r.dx + r.dy * r.dy + r.dz * r.dz;
float qb = 2 * ((r.dx * r.ox) + (r.dy * r.oy) + (r.dz * r.oz));
double[] t = Solvers.solveQuadric(qa, qb, qc);
// early rejection
if (t == null || t[0] >= r.getMax() || t[1] <= r.getMin())
return;
qt = (float)t[0];
}
float dist = float.PositiveInfinity;
float rox = r.ox + qt * r.dx;
float roy = r.oy + qt * r.dy;
float roz = r.oz + qt * r.dz;
float invRayLength = (float)(1 / Math.Sqrt(r.dx * r.dx + r.dy * r.dy + r.dz * r.dz));
// now we can start intersection
while (true)
{
float zw = rox;
float zx = roy;
float zy = roz;
float zz = 0;
float zpw = 1;
float zpx = 0;
float zpy = 0;
float zpz = 0;
// run several iterations
float dotz = 0;
for (int i = 0; i < maxIterations; i++)
{
{
// zp = 2 * (z * zp)
float nw = zw * zpw - zx * zpx - zy * zpy - zz * zpz;
float nx = zw * zpx + zx * zpw + zy * zpz - zz * zpy;
float ny = zw * zpy + zy * zpw + zz * zpx - zx * zpz;
zpz = 2 * (zw * zpz + zz * zpw + zx * zpy - zy * zpx);
zpw = 2 * nw;
zpx = 2 * nx;
zpy = 2 * ny;
}
{
// z = z*z + c
float nw = zw * zw - zx * zx - zy * zy - zz * zz + cw;
zx = 2 * zw * zx + cx;
zy = 2 * zw * zy + cy;
zz = 2 * zw * zz + cz;
zw = nw;
}
dotz = zw * zw + zx * zx + zy * zy + zz * zz;
if (dotz > ESCAPE_THRESHOLD)
break;
}
float normZ = (float)Math.Sqrt(dotz);
dist = 0.5f * normZ * (float)Math.Log(normZ) / Length(zpw, zpx, zpy, zpz);
rox += dist * r.dx;
roy += dist * r.dy;
roz += dist * r.dz;
qt += dist;
if (dist * invRayLength < epsilon)
break;
if (rox * rox + roy * roy + roz * roz > BOUNDING_RADIUS2)
return;
}
// now test t value again
if (!r.isInside(qt))
return;
if (dist * invRayLength < epsilon)
{
// valid hit
r.setMax(qt);
state.setIntersection(0, 0, 0);
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
// intersect in local space
float rd2x = r.dx * r.dx;
float rd2y = r.dy * r.dy;
float rd2z = r.dz * r.dz;
float ro2x = r.ox * r.ox;
float ro2y = r.oy * r.oy;
float ro2z = r.oz * r.oz;
// compute some common factors
double alpha = rd2x + rd2y + rd2z;
double beta = 2 * (r.ox * r.dx + r.oy * r.dy + r.oz * r.dz);
double gamma = (ro2x + ro2y + ro2z) - ri2 - ro2;
// setup quartic coefficients
double A = alpha * alpha;
double B = 2 * alpha * beta;
double C = beta * beta + 2 * alpha * gamma + 4 * ro2 * rd2z;
double D = 2 * beta * gamma + 8 * ro2 * r.oz * r.dz;
double E = gamma * gamma + 4 * ro2 * ro2z - 4 * ro2 * ri2;
// solve equation
double[] t = Solvers.solveQuartic(A, B, C, D, E);
if (t != null)
{
// early rejection
if (t[0] >= r.getMax() || t[t.Length - 1] <= r.getMin())
return;
// find first intersection in front of the ray
for (int i = 0; i < t.Length; i++)
{
if (t[i] > r.getMin())
{
r.setMax((float)t[i]);
state.setIntersection(0, 0, 0);
return;
}
}
}
}
public void intersect(Ray r, IntersectionState state)
{
float intervalMin = r.getMin();
float intervalMax = r.getMax();
float orgX = r.ox;
float dirX = r.dx, invDirX = 1 / dirX;
float t1, t2;
t1 = (bounds.getMinimum().x - orgX) * invDirX;
t2 = (bounds.getMaximum().x - orgX) * invDirX;
if (invDirX > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgY = r.oy;
float dirY = r.dy, invDirY = 1 / dirY;
t1 = (bounds.getMinimum().y - orgY) * invDirY;
t2 = (bounds.getMaximum().y - orgY) * invDirY;
if (invDirY > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
float orgZ = r.oz;
float dirZ = r.dz, invDirZ = 1 / dirZ;
t1 = (bounds.getMinimum().z - orgZ) * invDirZ;
t2 = (bounds.getMaximum().z - orgZ) * invDirZ;
if (invDirZ > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
return;
// compute custom offsets from direction sign bit
int offsetXFront = (int)((uint)ByteUtil.floatToRawIntBits(dirX) >> 31);//>>>
int offsetYFront = (int)((uint)ByteUtil.floatToRawIntBits(dirY) >> 31);//>>>
int offsetZFront = (int)((uint)ByteUtil.floatToRawIntBits(dirZ) >> 31);//>>>
int offsetXBack = offsetXFront ^ 1;
int offsetYBack = offsetYFront ^ 1;
int offsetZBack = offsetZFront ^ 1;
int offsetXFront3 = offsetXFront * 3;
int offsetYFront3 = offsetYFront * 3;
int offsetZFront3 = offsetZFront * 3;
int offsetXBack3 = offsetXBack * 3;
int offsetYBack3 = offsetYBack * 3;
int offsetZBack3 = offsetZBack * 3;
// avoid always adding 1 during the inner loop
offsetXFront++;
offsetYFront++;
offsetZFront++;
offsetXBack++;
offsetYBack++;
offsetZBack++;
IntersectionState.StackNode[] stack = state.getStack();
int stackTop = state.getStackTop();
int stackPos = stackTop;
int node = 0;
while (true)
{
pushloop:
while (true)
{
int tn = tree[node];
int axis = tn & (7 << 29);
int offset = tn & ~(7 << 29);
switch (axis)
{
case 0:
{
// x axis
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetXFront]) - orgX) * invDirX;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetXBack]) - orgX) * invDirX;
// ray passes between clip zones
if (tf < intervalMin && tb > intervalMax)
goto pushloopend;
int back = offset + offsetXBack3;
node = back;
// ray passes through far node only
if (tf < intervalMin)
{
intervalMin = (tb >= intervalMin) ? tb : intervalMin;
continue;
}
node = offset + offsetXFront3; // front
// ray passes through near node only
if (tb > intervalMax)
{
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
// ray passes through both nodes
// push back node
stack[stackPos].node = back;
stack[stackPos].near = (tb >= intervalMin) ? tb : intervalMin;
stack[stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
case 1 << 30:
{
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetYFront]) - orgY) * invDirY;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetYBack]) - orgY) * invDirY;
// ray passes between clip zones
if (tf < intervalMin && tb > intervalMax)
goto pushloopend;
int back = offset + offsetYBack3;
node = back;
// ray passes through far node only
if (tf < intervalMin)
{
intervalMin = (tb >= intervalMin) ? tb : intervalMin;
continue;
}
node = offset + offsetYFront3; // front
// ray passes through near node only
if (tb > intervalMax)
{
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
// ray passes through both nodes
// push back node
stack[stackPos].node = back;
stack[stackPos].near = (tb >= intervalMin) ? tb : intervalMin;
stack[stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
case 2 << 30:
{
// z axis
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetZFront]) - orgZ) * invDirZ;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetZBack]) - orgZ) * invDirZ;
// ray passes between clip zones
if (tf < intervalMin && tb > intervalMax)
goto pushloopend;
int back = offset + offsetZBack3;
node = back;
// ray passes through far node only
if (tf < intervalMin)
{
intervalMin = (tb >= intervalMin) ? tb : intervalMin;
continue;
}
node = offset + offsetZFront3; // front
// ray passes through near node only
if (tb > intervalMax)
{
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
// ray passes through both nodes
// push back node
stack[stackPos].node = back;
stack[stackPos].near = (tb >= intervalMin) ? tb : intervalMin;
stack[stackPos].far = intervalMax;
stackPos++;
// update ray interval for front node
intervalMax = (tf <= intervalMax) ? tf : intervalMax;
continue;
}
case 3 << 30:
{
// leaf - test some objects
int n = tree[node + 1];
while (n > 0)
{
primitives.intersectPrimitive(r, objects[offset], state);
n--;
offset++;
}
goto pushloopend;
}
case 1 << 29:
{
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetXFront]) - orgX) * invDirX;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetXBack]) - orgX) * invDirX;
node = offset;
intervalMin = (tf >= intervalMin) ? tf : intervalMin;
intervalMax = (tb <= intervalMax) ? tb : intervalMax;
if (intervalMin > intervalMax)
goto pushloopend;
continue;
}
case 3 << 29:
{
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetYFront]) - orgY) * invDirY;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetYBack]) - orgY) * invDirY;
node = offset;
intervalMin = (tf >= intervalMin) ? tf : intervalMin;
intervalMax = (tb <= intervalMax) ? tb : intervalMax;
if (intervalMin > intervalMax)
goto pushloopend;
continue;
}
case 5 << 29:
{
float tf = (ByteUtil.intBitsToFloat(tree[node + offsetZFront]) - orgZ) * invDirZ;
float tb = (ByteUtil.intBitsToFloat(tree[node + offsetZBack]) - orgZ) * invDirZ;
node = offset;
intervalMin = (tf >= intervalMin) ? tf : intervalMin;
intervalMax = (tb <= intervalMax) ? tb : intervalMax;
if (intervalMin > intervalMax)
goto pushloopend;
continue;
}
default:
return; // should not happen
} // switch
} // traversal loop
pushloopend:
do
{
// stack is empty?
if (stackPos == stackTop)
return;
// move back up the stack
stackPos--;
intervalMin = stack[stackPos].near;
if (r.getMax() < intervalMin)
continue;
node = stack[stackPos].node;
intervalMax = stack[stackPos].far;
break;
} while (true);
}
}
public void intersectPrimitive(Ray r, int primID, IntersectionState state)
{
// ray patch intersection
float[] stack = state.getRobustStack();
int STACKSIZE = 64;
{
// init patch
float[] patch = patches[primID];
for (int i = 0; i < 4 * 4 * 3; i++)
stack[i] = patch[i];
stack[48] = float.PositiveInfinity; // bbox size
stack[49] = 0; // umin
stack[50] = 0; // vmin
stack[51] = 1; // umax
stack[52] = 1; // vmax
}
int stackpos = 0;
float orgX = r.ox, invDirX = 1 / r.dx;
float orgY = r.oy, invDirY = 1 / r.dy;
float orgZ = r.oz, invDirZ = 1 / r.dz;
float t1, t2;
while (stackpos >= 0)
{
float intervalMin = r.getMin();
float intervalMax = r.getMax();
// x-axis bbox
float minx = stack[stackpos + 0];
float maxx = stack[stackpos + 0];
for (int j = 1, idx = stackpos + 3; j < 4 * 4; j++, idx += 3)
{
if (minx > stack[idx])
minx = stack[idx];
if (maxx < stack[idx])
maxx = stack[idx];
}
t1 = (minx - orgX) * invDirX;
t2 = (maxx - orgX) * invDirX;
if (invDirX > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= STACKSIZE;
continue;
}
// y-axis bbox
float miny = stack[stackpos + 1];
float maxy = stack[stackpos + 1];
for (int j = 1, idx = stackpos + 4; j < 4 * 4; j++, idx += 3)
{
if (miny > stack[idx])
miny = stack[idx];
if (maxy < stack[idx])
maxy = stack[idx];
}
t1 = (miny - orgY) * invDirY;
t2 = (maxy - orgY) * invDirY;
if (invDirY > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= STACKSIZE;
continue;
}
// z-axis bbox
float minz = stack[stackpos + 2];
float maxz = stack[stackpos + 2];
for (int j = 1, idx = stackpos + 5; j < 4 * 4; j++, idx += 3)
{
if (minz > stack[idx])
minz = stack[idx];
if (maxz < stack[idx])
maxz = stack[idx];
}
t1 = (minz - orgZ) * invDirZ;
t2 = (maxz - orgZ) * invDirZ;
if (invDirZ > 0)
{
if (t1 > intervalMin)
intervalMin = t1;
if (t2 < intervalMax)
intervalMax = t2;
}
else
{
if (t2 > intervalMin)
intervalMin = t2;
if (t1 < intervalMax)
intervalMax = t1;
}
if (intervalMin > intervalMax)
{
stackpos -= STACKSIZE;
continue;
}
// intersection was found - keep going
float size = (maxx - minx) + (maxy - miny) + (maxz - minz);
if (ByteUtil.floatToRawIntBits(stack[stackpos + 48]) == ByteUtil.floatToRawIntBits(size))
{
// L1 norm is 0, we are done
r.setMax(intervalMin);
state.setIntersection(primID, stack[stackpos + 49], stack[stackpos + 50]);
stackpos -= STACKSIZE;
continue;
}
// not small enough yet - subdivide
// lets pick a subdivision axis first:
float sizeu = 0;
float sizev = 0;
for (int i = 0; i < 3; i++)
{
sizeu += System.Math.Abs(stack[stackpos + (0 * 4 + 3) * 3 + i] - stack[stackpos + i]);
sizev += System.Math.Abs(stack[stackpos + (3 * 4 + 0) * 3 + i] - stack[stackpos + i]);
}
if (sizeu > sizev)
{
// split in U direction
for (int i = 0; i < 4; i++)
{
for (int axis = 0; axis < 3; axis++)
{
// load data
float p0 = stack[stackpos + (i * 4 + 0) * 3 + axis];
float p1 = stack[stackpos + (i * 4 + 1) * 3 + axis];
float p2 = stack[stackpos + (i * 4 + 2) * 3 + axis];
float p3 = stack[stackpos + (i * 4 + 3) * 3 + axis];
// Split curve in the middle
float q0 = p0;
float q1 = (p0 + p1) * 0.5f;
float q2 = q1 * 0.5f + (p1 + p2) * 0.25f;
float r3 = p3;
float r2 = (p2 + p3) * 0.5f;
float r1 = r2 * 0.5f + (p1 + p2) * 0.25f;
float q3 = (q2 + r1) * 0.5f;
float r0 = q3;
// load new curve data into the stack
stack[stackpos + (i * 4 + 0) * 3 + axis] = q0;
stack[stackpos + (i * 4 + 1) * 3 + axis] = q1;
stack[stackpos + (i * 4 + 2) * 3 + axis] = q2;
stack[stackpos + (i * 4 + 3) * 3 + axis] = q3;
stack[stackpos + STACKSIZE + (i * 4 + 0) * 3 + axis] = r0;
stack[stackpos + STACKSIZE + (i * 4 + 1) * 3 + axis] = r1;
stack[stackpos + STACKSIZE + (i * 4 + 2) * 3 + axis] = r2;
stack[stackpos + STACKSIZE + (i * 4 + 3) * 3 + axis] = r3;
}
}
// copy current bbox size
stack[stackpos + 48] = stack[stackpos + STACKSIZE + 48] = size;
// finally - split uv ranges
float umin = stack[stackpos + 49];
float umax = stack[stackpos + 51];
stack[stackpos + 49] = umin;
stack[stackpos + STACKSIZE + 50] = stack[stackpos + 50];
stack[stackpos + 51] = stack[stackpos + STACKSIZE + 49] = (umin + umax) * 0.5f;
stack[stackpos + STACKSIZE + 51] = umax;
stack[stackpos + STACKSIZE + 52] = stack[stackpos + 52];
}
else
{
// split in V direction
for (int i = 0; i < 4; i++)
{
for (int axis = 0; axis < 3; axis++)
{
// load data
float p0 = stack[stackpos + (0 * 4 + i) * 3 + axis];
float p1 = stack[stackpos + (1 * 4 + i) * 3 + axis];
float p2 = stack[stackpos + (2 * 4 + i) * 3 + axis];
float p3 = stack[stackpos + (3 * 4 + i) * 3 + axis];
// Split curve in the middle
float q0 = p0;
float q1 = (p0 + p1) * 0.5f;
float q2 = q1 * 0.5f + (p1 + p2) * 0.25f;
float r3 = p3;
float r2 = (p2 + p3) * 0.5f;
float r1 = r2 * 0.5f + (p1 + p2) * 0.25f;
float q3 = (q2 + r1) * 0.5f;
float r0 = q3;
// load new curve data into the stack
stack[stackpos + (0 * 4 + i) * 3 + axis] = q0;
stack[stackpos + (1 * 4 + i) * 3 + axis] = q1;
stack[stackpos + (2 * 4 + i) * 3 + axis] = q2;
stack[stackpos + (3 * 4 + i) * 3 + axis] = q3;
stack[stackpos + STACKSIZE + (0 * 4 + i) * 3 + axis] = r0;
stack[stackpos + STACKSIZE + (1 * 4 + i) * 3 + axis] = r1;
stack[stackpos + STACKSIZE + (2 * 4 + i) * 3 + axis] = r2;
stack[stackpos + STACKSIZE + (3 * 4 + i) * 3 + axis] = r3;
}
}
// copy current bbox size
stack[stackpos + 48] = stack[stackpos + STACKSIZE + 48] = size;
// finally - split uv ranges
float vmin = stack[stackpos + 50];
float vmax = stack[stackpos + 52];
stack[stackpos + STACKSIZE + 49] = stack[stackpos + 49];
stack[stackpos + 50] = vmin;
stack[stackpos + 52] = stack[stackpos + STACKSIZE + 50] = (vmin + vmax) * 0.5f;
stack[stackpos + STACKSIZE + 51] = stack[stackpos + 51];
stack[stackpos + STACKSIZE + 52] = vmax;
}
stackpos += STACKSIZE;
}
}
