public void getPhoton(double randX1, double randY1, double randX2, double randY2, Point3 p, Vector3 dir, Color power)
{
float z = (float)(1 - 2 * randX2);
float r = (float)Math.Sqrt(Math.Max(0, 1 - z * z));
float phi = (float)(2 * Math.PI * randY2);
float x = r * (float)Math.Cos(phi);
float y = r * (float)Math.Sin(phi);
p.x = center.x + x * radius;
p.y = center.y + y * radius;
p.z = center.z + z * radius;
OrthoNormalBasis basis = OrthoNormalBasis.makeFromW(new Vector3(x, y, z));
phi = (float)(2 * Math.PI * randX1);
float cosPhi = (float)Math.Cos(phi);
float sinPhi = (float)Math.Sin(phi);
float sinTheta = (float)Math.Sqrt(randY1);
float cosTheta = (float)Math.Sqrt(1 - randY1);
dir.x = cosPhi * sinTheta;
dir.y = sinPhi * sinTheta;
dir.z = cosTheta;
basis.transform(dir);
power.set(radiance);
power.mul((float)(Math.PI * Math.PI * 4 * r2));
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
// get local point
Point3 p = state.transformWorldToObject(state.getPoint());
// compute local normal
float deriv = p.x * p.x + p.y * p.y + p.z * p.z - ri2 - ro2;
state.getNormal().set(p.x * deriv, p.y * deriv, p.z * deriv + 2 * ro2 * p.z);
state.getNormal().normalize();
double phi = Math.Asin(MathUtils.clamp(p.z / ri, -1, 1));
double theta = Math.Atan2(p.y, p.x);
if (theta < 0)
{
theta += 2 * Math.PI;
}
state.getUV().x = (float)(theta / (2 * Math.PI));
state.getUV().y = (float)((phi + Math.PI / 2) / Math.PI);
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
// into world space
Vector3 worldNormal = state.transformNormalObjectToWorld(state.getNormal());
state.getNormal().set(worldNormal);
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
// make basis in world space
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public DirectionalSpotlight()
{
src = new Point3(0, 0, 0);
dir = new Vector3(0, 0, -1);
dir.normalize();
basis = OrthoNormalBasis.makeFromW(dir);
r = 1;
r2 = r * r;
radiance = Color.WHITE;
}
public bool Update(ParameterList pl, SunflowAPI api)
{
src = pl.getPoint("source", src);
dir = pl.getVector("dir", dir);
dir.normalize();
r = pl.getFloat("radius", r);
basis = OrthoNormalBasis.makeFromW(dir);
r2 = r * r;
radiance = pl.getColor("radiance", radiance);
return(true);
}
/**
* Computes a phong specular response to the current light samples and
* global illumination.
*
* @param spec specular color
* @param power phong exponent
* @param numRays number of glossy rays to trace
* @return shaded color
*/
public Color specularPhong(Color spec, float power, int numRays)
{
// integrate a phong specular function
Color lr = Color.black();
if (!includeSpecular || spec.isBlack())
{
return(lr);
}
// reflected direction
float dn = 2 * cosND;
Vector3 refDir = new Vector3();
refDir.x = (dn * n.x) + r.dx;
refDir.y = (dn * n.y) + r.dy;
refDir.z = (dn * n.z) + r.dz;
// direct lighting
foreach (LightSample sample in this)
{
float cosNL = sample.dot(n);
float cosLR = sample.dot(refDir);
if (cosLR > 0)
{
lr.madd(cosNL * (float)Math.Pow(cosLR, power), sample.getSpecularRadiance());
}
}
// indirect lighting
if (numRays > 0)
{
int numSamples = getDepth() == 0 ? numRays : 1;
OrthoNormalBasis onb = OrthoNormalBasis.makeFromW(refDir);
float mul = (2.0f * (float)Math.PI / (power + 1)) / numSamples;
for (int i = 0; i < numSamples; i++)
{
// specular indirect lighting
double r1 = getRandom(i, 0, numSamples);
double r2 = getRandom(i, 1, numSamples);
double u = 2 * Math.PI * r1;
double s = (float)Math.Pow(r2, 1 / (power + 1));
double s1 = (float)Math.Sqrt(1 - s * s);
Vector3 w = new Vector3((float)(Math.Cos(u) * s1), (float)(Math.Sin(u) * s1), (float)s);
w = onb.transform(w, new Vector3());
float wn = Vector3.dot(w, n);
if (wn > 0)
{
lr.madd(wn * mul, traceGlossy(new Ray(p, w), i));
}
}
}
lr.mul(spec).mul((power + 2) / (2.0f * (float)Math.PI));
return(lr);
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
Vector3 worldNormal = state.transformNormalObjectToWorld(normal);
state.getNormal().set(worldNormal);
state.getGeoNormal().set(worldNormal);
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
Point3 p = state.transformWorldToObject(state.getPoint());
float hu, hv;
switch (k)
{
case 0:
{
hu = p.y;
hv = p.z;
break;
}
case 1:
{
hu = p.z;
hv = p.x;
break;
}
case 2:
{
hu = p.x;
hv = p.y;
break;
}
default:
hu = hv = 0;
break;
}
state.getUV().x = hu * bnu + hv * bnv + bnd;
state.getUV().y = hu * cnu + hv * cnv + cnd;
state.setBasis(OrthoNormalBasis.makeFromW(normal));
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
int n = state.getPrimitiveID();
/*
*
*
* switch (n)
* {
* case 0:
* state.getNormal().set(new Vector3(1, 0, 0));
* break;
* case 1:
* state.getNormal().set(new Vector3(-1, 0, 0));
* break;
* case 2:
* state.getNormal().set(new Vector3(0, 1, 0));
* break;
* case 3:
* state.getNormal().set(new Vector3(0, -1, 0));
* break;
* case 4:
* state.getNormal().set(new Vector3(0, 0, 1));
* break;
* case 5:
* state.getNormal().set(new Vector3(0, 0, -1));
* break;
* default:
* state.getNormal().set(new Vector3(0, 0, 0));
* break;
* }
*
*/
state.getNormal().set(normalVectors[n]);
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
state.setShader(state.getInstance().getShader(0));
state.setModifier(state.getInstance().getModifier(0));
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
Vector3 normal;
switch (state.getPrimitiveID())
{
case 0:
normal = new Vector3(-1, 0, 0);
break;
case 1:
normal = new Vector3(1, 0, 0);
break;
case 2:
normal = new Vector3(0, -1, 0);
break;
case 3:
normal = new Vector3(0, 1, 0);
break;
case 4:
normal = new Vector3(0, 0, -1);
break;
case 5:
normal = new Vector3(0, 0, 1);
break;
default:
normal = new Vector3(0, 0, 0);
break;
}
state.getNormal().set(state.transformNormalObjectToWorld(normal));
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
Point3 n = state.transformWorldToObject(state.getPoint());
state.getNormal().set(n.x * (2 * n.x * n.x - 1), n.y * (2 * n.y * n.y - 1), n.z * (2 * n.z * n.z - 1));
state.getNormal().normalize();
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
// into world space
Vector3 worldNormal = state.transformNormalObjectToWorld(state.getNormal());
state.getNormal().set(worldNormal);
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
// create basis in world space
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public bool update(ParameterList pl, SunflowAPI api)
{
Vector3 up = pl.getVector("up", null);
Vector3 east = pl.getVector("east", null);
if (up != null && east != null)
{
basis = OrthoNormalBasis.makeFromWV(up, east);
}
else if (up != null)
{
basis = OrthoNormalBasis.makeFromW(up);
}
numSkySamples = pl.getInt("samples", numSkySamples);
sunDirWorld = pl.getVector("sundir", sunDirWorld);
turbidity = pl.getFloat("turbidity", turbidity);
// recompute model
initSunSky();
return(true);
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
int n = state.getPrimitiveID();
switch (n)
{
case 0:
state.getNormal().set(new Vector3(1, 0, 0));
break;
case 1:
state.getNormal().set(new Vector3(-1, 0, 0));
break;
case 2:
state.getNormal().set(new Vector3(0, 1, 0));
break;
case 3:
state.getNormal().set(new Vector3(0, -1, 0));
break;
case 4:
state.getNormal().set(new Vector3(0, 0, 1));
break;
case 5:
state.getNormal().set(new Vector3(0, 0, -1));
break;
default:
state.getNormal().set(new Vector3(0, 0, 0));
break;
}
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
state.setShader(state.getInstance().getShader(0));
state.setModifier(state.getInstance().getModifier(0));
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
float u = state.getU();
float v = state.getV();
float[] bu = bernstein(u);
float[] bdu = bernsteinDeriv(u);
float[] bv = bernstein(v);
float[] bdv = bernsteinDeriv(v);
getPatchPoint(u, v, patches[state.getPrimitiveID()], bu, bv, bdu, bdv, new Point3(), state.getNormal());
state.getNormal().set(parent.transformNormalObjectToWorld(state.getNormal()));
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
state.getUV().set(u, v);
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
// FIXME: use actual derivatives to create basis
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public void modify(ShadingState state)
{
Point3 p = state.transformWorldToObject(state.getPoint());
p.x *= size;
p.y *= size;
p.z *= size;
Vector3 normal = state.transformNormalWorldToObject(state.getNormal());
double f0 = f(p.x, p.y, p.z);
double fx = f(p.x + .0001, p.y, p.z);
double fy = f(p.x, p.y + .0001, p.z);
double fz = f(p.x, p.y, p.z + .0001);
normal.x -= scale * (float)((fx - f0) / .0001);
normal.y -= scale * (float)((fy - f0) / .0001);
normal.z -= scale * (float)((fz - f0) / .0001);
normal.normalize();
state.getNormal().set(state.transformNormalObjectToWorld(normal));
state.getNormal().normalize();
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public void getPhoton(double randX1, double randY1, double randX2, double randY2, Point3 p, Vector3 dir, Color power)
{
double rnd = randX1 * totalArea;
int j = areas.Length - 1;
for (int i = 0; i < areas.Length; i++)
{
if (rnd < areas[i])
{
j = i;
break;
}
rnd -= areas[i]; // try next triangle
}
rnd /= areas[j];
randX1 = rnd;
double s = Math.Sqrt(1 - randX2);
float u = (float)(randY2 * s);
float v = (float)(1 - s);
float w = 1 - u - v;
int tri3 = j * 3;
int index0 = 3 * triangles[tri3 + 0];
int index1 = 3 * triangles[tri3 + 1];
int index2 = 3 * triangles[tri3 + 2];
p.x = w * points[index0 + 0] + u * points[index1 + 0] + v * points[index2 + 0];
p.y = w * points[index0 + 1] + u * points[index1 + 1] + v * points[index2 + 1];
p.z = w * points[index0 + 2] + u * points[index1 + 2] + v * points[index2 + 2];
p.x += 0.001f * ngs[j].x;
p.y += 0.001f * ngs[j].y;
p.z += 0.001f * ngs[j].z;
OrthoNormalBasis onb = OrthoNormalBasis.makeFromW(ngs[j]);
u = (float)(2 * Math.PI * randX1);
s = Math.Sqrt(randY1);
onb.transform(new Vector3((float)(Math.Cos(u) * s), (float)(Math.Sin(u) * s), (float)(Math.Sqrt(1 - randY1))), dir);
Color.mul((float)Math.PI * areas[j], radiance, power);
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Point3 localPoint = state.transformWorldToObject(state.getPoint());
localPoint.x -= particles[3 * state.getPrimitiveID() + 0];
localPoint.y -= particles[3 * state.getPrimitiveID() + 1];
localPoint.z -= particles[3 * state.getPrimitiveID() + 2];
state.getNormal().set(localPoint.x, localPoint.y, localPoint.z);
state.getNormal().normalize();
state.setShader(state.getInstance().getShader(0));
state.setModifier(state.getInstance().getModifier(0));
// into object space
Vector3 worldNormal = state.transformNormalObjectToWorld(state.getNormal());
state.getNormal().set(worldNormal);
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public void getPhoton(double randX1, double randY1, double randX2, double randY2, Point3 p, Vector3 dir, Color power)
{
double s = Math.Sqrt(1 - randX2);
float u = (float)(randY2 * s);
float v = (float)(1 - s);
float w = 1 - u - v;
int index0 = 3 * meshlight.triangles[tri3 + 0];
int index1 = 3 * meshlight.triangles[tri3 + 1];
int index2 = 3 * meshlight.triangles[tri3 + 2];
p.x = w * meshlight.points[index0 + 0] + u * meshlight.points[index1 + 0] + v * meshlight.points[index2 + 0];
p.y = w * meshlight.points[index0 + 1] + u * meshlight.points[index1 + 1] + v * meshlight.points[index2 + 1];
p.z = w * meshlight.points[index0 + 2] + u * meshlight.points[index1 + 2] + v * meshlight.points[index2 + 2];
p.x += 0.001f * ng.x;
p.y += 0.001f * ng.y;
p.z += 0.001f * ng.z;
OrthoNormalBasis onb = OrthoNormalBasis.makeFromW(ng);
u = (float)(2 * Math.PI * randX1);
s = Math.Sqrt(randY1);
onb.transform(new Vector3((float)(Math.Cos(u) * s), (float)(Math.Sin(u) * s), (float)(Math.Sqrt(1 - randY1))), dir);
Color.mul((float)Math.PI * area, meshlight.radiance, power);
}
public void ScatterPhoton(ShadingState state, Color power)
{
int side = state.getPrimitiveID();
Color kd = null;
switch (side)
{
case 0:
kd = left;
break;
case 1:
kd = right;
break;
case 3:
kd = back;
break;
case 4:
kd = bottom;
break;
case 5:
float lx = state.getPoint().x;
float ly = state.getPoint().y;
if (lx >= lxmin && lx < lxmax && ly >= lymin && ly < lymax && state.getRay().dz > 0)
{
return;
}
kd = top;
break;
default:
Debug.Assert(false);
break;
}
// make sure we are on the right side of the material
if (Vector3.dot(state.getNormal(), state.getRay().getDirection()) > 0)
{
state.getNormal().negate();
state.getGeoNormal().negate();
}
state.storePhoton(state.getRay().getDirection(), power, kd);
double avg = kd.getAverage();
double rnd = state.getRandom(0, 0, 1);
if (rnd < avg)
{
// photon is scattered
power.mul(kd).mul(1 / (float)avg);
OrthoNormalBasis onb = OrthoNormalBasis.makeFromW(state.getNormal());
double u = 2 * Math.PI * rnd / avg;
double v = state.getRandom(0, 1, 1);
float s = (float)Math.Sqrt(v);
float s1 = (float)Math.Sqrt(1.0 - v);
Vector3 w = new Vector3((float)Math.Cos(u) * s, (float)Math.Sin(u) * s, s1);
w = onb.transform(w, new Vector3());
state.traceDiffusePhoton(new Ray(state.getPoint(), w), power);
}
}
public void prepareShadingState(ShadingState state)
{
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
// compute local normal
Point3 p = state.transformWorldToObject(state.getPoint());
float gx1w = p.x - DELTA;
float gx1x = p.y;
float gx1y = p.z;
float gx1z = 0;
float gx2w = p.x + DELTA;
float gx2x = p.y;
float gx2y = p.z;
float gx2z = 0;
float gy1w = p.x;
float gy1x = p.y - DELTA;
float gy1y = p.z;
float gy1z = 0;
float gy2w = p.x;
float gy2x = p.y + DELTA;
float gy2y = p.z;
float gy2z = 0;
float gz1w = p.x;
float gz1x = p.y;
float gz1y = p.z - DELTA;
float gz1z = 0;
float gz2w = p.x;
float gz2x = p.y;
float gz2y = p.z + DELTA;
float gz2z = 0;
for (int i = 0; i < maxIterations; i++)
{
{
// z = z*z + c
float nw = gx1w * gx1w - gx1x * gx1x - gx1y * gx1y - gx1z * gx1z + cw;
gx1x = 2 * gx1w * gx1x + cx;
gx1y = 2 * gx1w * gx1y + cy;
gx1z = 2 * gx1w * gx1z + cz;
gx1w = nw;
}
{
// z = z*z + c
float nw = gx2w * gx2w - gx2x * gx2x - gx2y * gx2y - gx2z * gx2z + cw;
gx2x = 2 * gx2w * gx2x + cx;
gx2y = 2 * gx2w * gx2y + cy;
gx2z = 2 * gx2w * gx2z + cz;
gx2w = nw;
}
{
// z = z*z + c
float nw = gy1w * gy1w - gy1x * gy1x - gy1y * gy1y - gy1z * gy1z + cw;
gy1x = 2 * gy1w * gy1x + cx;
gy1y = 2 * gy1w * gy1y + cy;
gy1z = 2 * gy1w * gy1z + cz;
gy1w = nw;
}
{
// z = z*z + c
float nw = gy2w * gy2w - gy2x * gy2x - gy2y * gy2y - gy2z * gy2z + cw;
gy2x = 2 * gy2w * gy2x + cx;
gy2y = 2 * gy2w * gy2y + cy;
gy2z = 2 * gy2w * gy2z + cz;
gy2w = nw;
}
{
// z = z*z + c
float nw = gz1w * gz1w - gz1x * gz1x - gz1y * gz1y - gz1z * gz1z + cw;
gz1x = 2 * gz1w * gz1x + cx;
gz1y = 2 * gz1w * gz1y + cy;
gz1z = 2 * gz1w * gz1z + cz;
gz1w = nw;
}
{
// z = z*z + c
float nw = gz2w * gz2w - gz2x * gz2x - gz2y * gz2y - gz2z * gz2z + cw;
gz2x = 2 * gz2w * gz2x + cx;
gz2y = 2 * gz2w * gz2y + cy;
gz2z = 2 * gz2w * gz2z + cz;
gz2w = nw;
}
}
float gradX = Length(gx2w, gx2x, gx2y, gx2z) - Length(gx1w, gx1x, gx1y, gx1z);
float gradY = Length(gy2w, gy2x, gy2y, gy2z) - Length(gy1w, gy1x, gy1y, gy1z);
float gradZ = Length(gz2w, gz2x, gz2y, gz2z) - Length(gz1w, gz1x, gz1y, gz1z);
Vector3 n = new Vector3(gradX, gradY, gradZ);
state.getNormal().set(state.transformNormalObjectToWorld(n));
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
state.getPoint().x += state.getNormal().x *epsilon * 20;
state.getPoint().y += state.getNormal().y *epsilon * 20;
state.getPoint().z += state.getNormal().z *epsilon * 20;
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
}
public void modify(ShadingState state)
{
// apply bump
state.getNormal().set(bumpTexture.getBump(state.getUV().x, state.getUV().y, state.getBasis(), scale));
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public void prepareShadingState(ShadingState state)
{
state.init();
Instance parent = state.getInstance();
int primID = state.getPrimitiveID();
float u = state.getU();
float v = state.getV();
float w = 1 - u - v;
// state.getRay().getPoint(state.getPoint());
int tri = 3 * primID;
int index0 = triangleMesh.triangles[tri + 0];
int index1 = triangleMesh.triangles[tri + 1];
int index2 = triangleMesh.triangles[tri + 2];
Point3 v0p = triangleMesh.getPoint(index0);
Point3 v1p = triangleMesh.getPoint(index1);
Point3 v2p = triangleMesh.getPoint(index2);
// get object space point from barycentric coordinates
state.getPoint().x = w * v0p.x + u * v1p.x + v * v2p.x;
state.getPoint().y = w * v0p.y + u * v1p.y + v * v2p.y;
state.getPoint().z = w * v0p.z + u * v1p.z + v * v2p.z;
// move into world space
state.getPoint().set(state.transformObjectToWorld(state.getPoint()));
Vector3 ng = Point3.normal(v0p, v1p, v2p);
if (parent != null)
{
ng = state.transformNormalObjectToWorld(ng);
}
ng.normalize();
state.getGeoNormal().set(ng);
switch (triangleMesh.normals.interp)
{
case ParameterList.InterpolationType.NONE:
case ParameterList.InterpolationType.FACE:
{
state.getNormal().set(ng);
break;
}
case ParameterList.InterpolationType.VERTEX:
{
int i30 = 3 * index0;
int i31 = 3 * index1;
int i32 = 3 * index2;
float[] normals = triangleMesh.normals.data;
state.getNormal().x = w * normals[i30 + 0] + u * normals[i31 + 0] + v * normals[i32 + 0];
state.getNormal().y = w * normals[i30 + 1] + u * normals[i31 + 1] + v * normals[i32 + 1];
state.getNormal().z = w * normals[i30 + 2] + u * normals[i31 + 2] + v * normals[i32 + 2];
if (parent != null)
{
state.getNormal().set(state.transformNormalObjectToWorld(state.getNormal()));
}
state.getNormal().normalize();
break;
}
case ParameterList.InterpolationType.FACEVARYING:
{
int idx = 3 * tri;
float[] normals = triangleMesh.normals.data;
state.getNormal().x = w * normals[idx + 0] + u * normals[idx + 3] + v * normals[idx + 6];
state.getNormal().y = w * normals[idx + 1] + u * normals[idx + 4] + v * normals[idx + 7];
state.getNormal().z = w * normals[idx + 2] + u * normals[idx + 5] + v * normals[idx + 8];
if (parent != null)
{
state.getNormal().set(state.transformNormalObjectToWorld(state.getNormal()));
}
state.getNormal().normalize();
break;
}
}
float uv00 = 0, uv01 = 0, uv10 = 0, uv11 = 0, uv20 = 0, uv21 = 0;
switch (triangleMesh.uvs.interp)
{
case ParameterList.InterpolationType.NONE:
case ParameterList.InterpolationType.FACE:
{
state.getUV().x = 0;
state.getUV().y = 0;
break;
}
case ParameterList.InterpolationType.VERTEX:
{
int i20 = 2 * index0;
int i21 = 2 * index1;
int i22 = 2 * index2;
float[] uvs = triangleMesh.uvs.data;
uv00 = uvs[i20 + 0];
uv01 = uvs[i20 + 1];
uv10 = uvs[i21 + 0];
uv11 = uvs[i21 + 1];
uv20 = uvs[i22 + 0];
uv21 = uvs[i22 + 1];
break;
}
case ParameterList.InterpolationType.FACEVARYING:
{
int idx = tri << 1;
float[] uvs = triangleMesh.uvs.data;
uv00 = uvs[idx + 0];
uv01 = uvs[idx + 1];
uv10 = uvs[idx + 2];
uv11 = uvs[idx + 3];
uv20 = uvs[idx + 4];
uv21 = uvs[idx + 5];
break;
}
}
if (triangleMesh.uvs.interp != ParameterList.InterpolationType.NONE)
{
// get exact uv coords and compute tangent vectors
state.getUV().x = w * uv00 + u * uv10 + v * uv20;
state.getUV().y = w * uv01 + u * uv11 + v * uv21;
float du1 = uv00 - uv20;
float du2 = uv10 - uv20;
float dv1 = uv01 - uv21;
float dv2 = uv11 - uv21;
Vector3 dp1 = Point3.sub(v0p, v2p, new Vector3()), dp2 = Point3.sub(v1p, v2p, new Vector3());
float determinant = du1 * dv2 - dv1 * du2;
if (determinant == 0.0f)
{
// create basis in world space
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
else
{
float invdet = 1 / determinant;
// Vector3 dpdu = new Vector3();
// dpdu.x = (dv2 * dp1.x - dv1 * dp2.x) * invdet;
// dpdu.y = (dv2 * dp1.y - dv1 * dp2.y) * invdet;
// dpdu.z = (dv2 * dp1.z - dv1 * dp2.z) * invdet;
Vector3 dpdv = new Vector3();
dpdv.x = (-du2 * dp1.x + du1 * dp2.x) * invdet;
dpdv.y = (-du2 * dp1.y + du1 * dp2.y) * invdet;
dpdv.z = (-du2 * dp1.z + du1 * dp2.z) * invdet;
if (parent != null)
{
dpdv = state.transformVectorObjectToWorld(dpdv);
}
// create basis in world space
state.setBasis(OrthoNormalBasis.makeFromWV(state.getNormal(), dpdv));
}
}
else
{
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
int shaderIndex = triangleMesh.faceShaders == null ? 0 : (triangleMesh.faceShaders[primID] & 0xFF);
state.setShader(parent.getShader(shaderIndex));
}
public void prepareShadingState(ShadingState state)
{
state.init();
Instance parent = state.getInstance();
int primID = state.getPrimitiveID();
float u = state.getU();
float v = state.getV();
state.getRay().getPoint(state.getPoint());
int quad = 4 * primID;
int index0 = quads[quad + 0];
int index1 = quads[quad + 1];
int index2 = quads[quad + 2];
int index3 = quads[quad + 3];
Point3 v0p = getPoint(index0);
Point3 v1p = getPoint(index1);
Point3 v2p = getPoint(index2);
Point3 v3p = getPoint(index3);
float tanux = (1 - v) * (v1p.x - v0p.x) + v * (v2p.x - v3p.x);
float tanuy = (1 - v) * (v1p.y - v0p.y) + v * (v2p.y - v3p.y);
float tanuz = (1 - v) * (v1p.z - v0p.z) + v * (v2p.z - v3p.z);
float tanvx = (1 - u) * (v3p.x - v0p.x) + u * (v2p.x - v1p.x);
float tanvy = (1 - u) * (v3p.y - v0p.y) + u * (v2p.y - v1p.y);
float tanvz = (1 - u) * (v3p.z - v0p.z) + u * (v2p.z - v1p.z);
float nx = tanuy * tanvz - tanuz * tanvy;
float ny = tanuz * tanvx - tanux * tanvz;
float nz = tanux * tanvy - tanuy * tanvx;
Vector3 ng = new Vector3(nx, ny, nz);
ng = state.transformNormalObjectToWorld(ng);
ng.normalize();
state.getGeoNormal().set(ng);
float k00 = (1 - u) * (1 - v);
float k10 = u * (1 - v);
float k01 = (1 - u) * v;
float k11 = u * v;
switch (normals.interp)
{
case ParameterList.InterpolationType.NONE:
case ParameterList.InterpolationType.FACE:
{
state.getNormal().set(ng);
break;
}
case ParameterList.InterpolationType.VERTEX:
{
int i30 = 3 * index0;
int i31 = 3 * index1;
int i32 = 3 * index2;
int i33 = 3 * index3;
float[] normals1 = this.normals.data;
state.getNormal().x = k00 * normals1[i30 + 0] + k10 * normals1[i31 + 0] + k11 * normals1[i32 + 0] + k01 * normals1[i33 + 0];
state.getNormal().y = k00 * normals1[i30 + 1] + k10 * normals1[i31 + 1] + k11 * normals1[i32 + 1] + k01 * normals1[i33 + 1];
state.getNormal().z = k00 * normals1[i30 + 2] + k10 * normals1[i31 + 2] + k11 * normals1[i32 + 2] + k01 * normals1[i33 + 2];
state.getNormal().set(state.transformNormalObjectToWorld(state.getNormal()));
state.getNormal().normalize();
break;
}
case ParameterList.InterpolationType.FACEVARYING:
{
int idx = 3 * quad;
float[] normals1 = this.normals.data;
state.getNormal().x = k00 * normals1[idx + 0] + k10 * normals1[idx + 3] + k11 * normals1[idx + 6] + k01 * normals1[idx + 9];
state.getNormal().y = k00 * normals1[idx + 1] + k10 * normals1[idx + 4] + k11 * normals1[idx + 7] + k01 * normals1[idx + 10];
state.getNormal().z = k00 * normals1[idx + 2] + k10 * normals1[idx + 5] + k11 * normals1[idx + 8] + k01 * normals1[idx + 11];
state.getNormal().set(state.transformNormalObjectToWorld(state.getNormal()));
state.getNormal().normalize();
break;
}
}
float uv00 = 0, uv01 = 0, uv10 = 0, uv11 = 0, uv20 = 0, uv21 = 0, uv30 = 0, uv31 = 0;
switch (uvs.interp)
{
case ParameterList.InterpolationType.NONE:
case ParameterList.InterpolationType.FACE:
{
state.getUV().x = 0;
state.getUV().y = 0;
break;
}
case ParameterList.InterpolationType.VERTEX:
{
int i20 = 2 * index0;
int i21 = 2 * index1;
int i22 = 2 * index2;
int i23 = 2 * index3;
float[] uvs1 = this.uvs.data;
uv00 = uvs1[i20 + 0];
uv01 = uvs1[i20 + 1];
uv10 = uvs1[i21 + 0];
uv11 = uvs1[i21 + 1];
uv20 = uvs1[i22 + 0];
uv21 = uvs1[i22 + 1];
uv20 = uvs1[i23 + 0];
uv21 = uvs1[i23 + 1];
break;
}
case ParameterList.InterpolationType.FACEVARYING:
{
int idx = quad << 1;
float[] uvs1 = this.uvs.data;
uv00 = uvs1[idx + 0];
uv01 = uvs1[idx + 1];
uv10 = uvs1[idx + 2];
uv11 = uvs1[idx + 3];
uv20 = uvs1[idx + 4];
uv21 = uvs1[idx + 5];
uv30 = uvs1[idx + 6];
uv31 = uvs1[idx + 7];
break;
}
}
if (uvs.interp != ParameterList.InterpolationType.NONE)
{
// get exact uv coords and compute tangent vectors
state.getUV().x = k00 * uv00 + k10 * uv10 + k11 * uv20 + k01 * uv30;
state.getUV().y = k00 * uv01 + k10 * uv11 + k11 * uv21 + k01 * uv31;
float du1 = uv00 - uv20;
float du2 = uv10 - uv20;
float dv1 = uv01 - uv21;
float dv2 = uv11 - uv21;
Vector3 dp1 = Point3.sub(v0p, v2p, new Vector3()), dp2 = Point3.sub(v1p, v2p, new Vector3());
float determinant = du1 * dv2 - dv1 * du2;
if (determinant == 0.0f)
{
// create basis in world space
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
else
{
float invdet = 1 / determinant;
// Vector3 dpdu = new Vector3();
// dpdu.x = (dv2 * dp1.x - dv1 * dp2.x) * invdet;
// dpdu.y = (dv2 * dp1.y - dv1 * dp2.y) * invdet;
// dpdu.z = (dv2 * dp1.z - dv1 * dp2.z) * invdet;
Vector3 dpdv = new Vector3();
dpdv.x = (-du2 * dp1.x + du1 * dp2.x) * invdet;
dpdv.y = (-du2 * dp1.y + du1 * dp2.y) * invdet;
dpdv.z = (-du2 * dp1.z + du1 * dp2.z) * invdet;
dpdv = state.transformVectorObjectToWorld(dpdv);
// create basis in world space
state.setBasis(OrthoNormalBasis.makeFromWV(state.getNormal(), dpdv));
}
}
else
{
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
int shaderIndex = faceShaders == null ? 0 : (faceShaders[primID] & 0xFF);
state.setShader(parent.getShader(shaderIndex));
state.setModifier(parent.getModifier(shaderIndex));
}
public void getSamples(ShadingState state)
{
if (getNumSamples() <= 0)
{
return;
}
Vector3 wc = Point3.sub(center, state.getPoint(), new Vector3());
float l2 = wc.LengthSquared();
if (l2 <= r2)
{
return; // inside the sphere?
}
// top of the sphere as viewed from the current shading point
float topX = wc.x + state.getNormal().x *radius;
float topY = wc.y + state.getNormal().y *radius;
float topZ = wc.z + state.getNormal().z *radius;
if (state.getNormal().dot(topX, topY, topZ) <= 0)
{
return; // top of the sphere is below the horizon
}
float cosThetaMax = (float)Math.Sqrt(Math.Max(0, 1 - r2 / Vector3.dot(wc, wc)));
OrthoNormalBasis basis = OrthoNormalBasis.makeFromW(wc);
int samples = state.getDiffuseDepth() > 0 ? 1 : getNumSamples();
float scale = (float)(2 * Math.PI * (1 - cosThetaMax));
Color c = Color.mul(scale / samples, radiance);
for (int i = 0; i < samples; i++)
{
// random offset on unit square
double randX = state.getRandom(i, 0, samples);
double randY = state.getRandom(i, 1, samples);
// cone sampling
double cosTheta = (1 - randX) * cosThetaMax + randX;
double sinTheta = Math.Sqrt(1 - cosTheta * cosTheta);
double phi = randY * 2 * Math.PI;
Vector3 dir = new Vector3((float)(Math.Cos(phi) * sinTheta), (float)(Math.Sin(phi) * sinTheta), (float)cosTheta);
basis.transform(dir);
// check that the direction of the sample is the same as the
// normal
float cosNx = Vector3.dot(dir, state.getNormal());
if (cosNx <= 0)
{
continue;
}
float ocx = state.getPoint().x - center.x;
float ocy = state.getPoint().y - center.y;
float ocz = state.getPoint().z - center.z;
float qa = Vector3.dot(dir, dir);
float qb = 2 * ((dir.x * ocx) + (dir.y * ocy) + (dir.z * ocz));
float qc = ((ocx * ocx) + (ocy * ocy) + (ocz * ocz)) - r2;
double[] t = Solvers.solveQuadric(qa, qb, qc);
if (t == null)
{
continue;
}
LightSample dest = new LightSample();
// compute shadow ray to the sampled point
dest.setShadowRay(new Ray(state.getPoint(), dir));
// FIXME: arbitrary bias, should handle as in other places
dest.getShadowRay().setMax((float)t[0] - 1e-3f);
// prepare sample
dest.setRadiance(c, c);
dest.traceShadow(state);
state.addSample(dest);
}
}
public void modify(ShadingState state)
{
// apply normal map
state.getNormal().set(normalMap.getNormal(state.getUV().x, state.getUV().y, state.getBasis()));
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}