void computeViewToProj(ref Vector3 rayDir, BBoundingBox worldBounds, Matrix worldToView, out Matrix viewToProj,
int numXSegments, int numYSegments, int xSegment, int ySegment)
{
BBoundingBox viewBounds = new BBoundingBox();
for (int i = 0; i < 8; i++)
{
Vector3 corner = worldBounds.getCorner((BBoundingBox.eCornerIndex)i);
Vector4 viewCorner = Vector3.Transform(corner, worldToView);
viewBounds.addPoint(viewCorner.X, viewCorner.Y, viewCorner.Z);
}
float minZ = viewBounds.min.Z; // *0.5f;
float maxZ = viewBounds.max.Z; // *2;
float distanceX = Math.Abs(viewBounds.max.X - viewBounds.min.X);
float segSizeX = distanceX / numXSegments;
float distanceY = Math.Abs(viewBounds.max.Y - viewBounds.min.Y);
float segSizeY = distanceY / numYSegments;
float minXSeg = viewBounds.min.X + (segSizeX * xSegment);
float minYSeg = viewBounds.min.Y + (segSizeY * ySegment);
viewToProj = Matrix.OrthoOffCenterLH(
minXSeg, minXSeg + segSizeX,
minYSeg, minYSeg + segSizeY,
minZ, maxZ);
}
//--------------------------------------------------------------------------
void computeTransforms(ref Vector3 rayDir, out Matrix worldToView, out Matrix viewToProj)
{
Vector3 mWorldMin = mScene.getWorldMin();
Vector3 mWorldMax = mScene.getWorldMax();
Vector3 eyePos = new Vector3((mWorldMin.X + mWorldMax.X) * .5f, mWorldMax.Y + 50.0f, (mWorldMin.Z + mWorldMax.Z) * .5f);
Vector3 focusPos = eyePos; focusPos.Y -= 1;
Vector3 upDir = BMathLib.unitZ;
worldToView = Matrix.LookAtLH(eyePos, focusPos, upDir);
BBoundingBox worldBounds = new BBoundingBox();
worldBounds.min = mWorldMin;
worldBounds.min.Y -= 2; //for depth peeling
worldBounds.max = mWorldMax;
worldBounds.max.Y += 2; //for depth peeling
BBoundingBox viewBounds = new BBoundingBox();
for (int i = 0; i < 8; i++)
{
Vector3 corner = worldBounds.getCorner((BBoundingBox.eCornerIndex)i);
Vector4 viewCorner = Vector3.Transform(corner, worldToView);
viewBounds.addPoint(viewCorner.X, viewCorner.Y, viewCorner.Z);
}
float minZ = viewBounds.min.Z;
float maxZ = viewBounds.max.Z;
float offsetX = 0.5f / (viewBounds.max.X - viewBounds.min.X);
float offsetY = 0;// -0.5f / (viewBounds.max.Y - viewBounds.min.Y);
viewToProj = Matrix.OrthoOffCenterLH(
viewBounds.min.X + offsetX, viewBounds.max.X + offsetX,
viewBounds.min.Y + offsetY, viewBounds.max.Y + offsetY,
minZ, maxZ);
}
//--------------------------------------------------------------------------
void computeTransforms(Vector3 upDir, ref Matrix worldToView, ref Matrix viewToProj, ref BBoundingBox worldBounds, ref double worldMinY, ref double worldMaxY)
{
float diameter = Vector3.Length(mWorldMax - mWorldMin);
float radius = diameter * 0.5f;
Vector3 worldCenter = (mWorldMax - mWorldMin) * 0.5f;
Vector3 eyePos = worldCenter + (BMathLib.unitY * radius);
Vector3 focusPos = worldCenter;
worldToView = Matrix.LookAtLH(eyePos, focusPos, upDir);
worldBounds.min = mWorldMin;
// worldBounds.min.Y -= 2;
worldBounds.max = mWorldMax;
// worldBounds.max.Y += 2;
//worldBounds.max.X += 1; //CLM WHAT?
//worldBounds.max.Z += 1; //CLM WHAT?
BBoundingBox viewBounds = new BBoundingBox();
for (int i = 0; i < 8; i++)
{
Vector3 corner = worldBounds.getCorner((BBoundingBox.eCornerIndex)i);
Vector4 viewCorner = Vector3.Transform(corner, worldToView);
viewBounds.addPoint(viewCorner.X, viewCorner.Y, viewCorner.Z);
}
float minZ = viewBounds.min.Z; // *0.5f;
float maxZ = viewBounds.max.Z; // *2;
viewToProj = Matrix.OrthoOffCenterLH(
viewBounds.min.X, viewBounds.max.X,
viewBounds.min.Y, viewBounds.max.Y,
minZ, maxZ);
worldMinY = eyePos.Y + -minZ;
worldMaxY = eyePos.Y + -maxZ;
}