ColorValue RenderPixel(Vec2I pixelIndex)
{
int triangleIndex = lightmapTriangleMap[pixelIndex.Y][pixelIndex.X];
if (triangleIndex == -1)
{
return(new ColorValue(-1, -1, -1, -1));
}
Mesh mesh = lightmapMeshObject.Mesh;
Mat4 transform = new Mat4(lightmapMeshObject.Rotation.ToMat3() *
Mat3.FromScale(lightmapMeshObject.Scale), lightmapMeshObject.Position);
Vec3 position;
Vec3 normal;
{
Vec2 texCoord = GetTexCoordByPixelIndex(pixelIndex);
int index0 = mesh.Indices[triangleIndex * 3 + 0];
int index1 = mesh.Indices[triangleIndex * 3 + 1];
int index2 = mesh.Indices[triangleIndex * 3 + 2];
Vec3 position0 = transform * mesh.Positions[index0];
Vec3 position1 = transform * mesh.Positions[index1];
Vec3 position2 = transform * mesh.Positions[index2];
Vec3 normal0 = lightmapMeshObject.Rotation * mesh.Normals[index0];
Vec3 normal1 = lightmapMeshObject.Rotation * mesh.Normals[index1];
Vec3 normal2 = lightmapMeshObject.Rotation * mesh.Normals[index2];
Vec2 texCoord0 = mesh.LightmapTexCoords[index0];
Vec2 texCoord1 = mesh.LightmapTexCoords[index1];
Vec2 texCoord2 = mesh.LightmapTexCoords[index2];
float coef0;
float coef1;
GetTriangePositionCoefficients(ref texCoord0, ref texCoord1, ref texCoord2,
ref texCoord, out coef0, out coef1);
//calculate position
{
Vec3 p01 = Vec3.Lerp(position0, position1, coef0);
Vec3 p02 = Vec3.Lerp(position0, position2, coef0);
position = Vec3.Lerp(p01, p02, coef1);
}
//calculate normal
{
Vec3 p01 = Vec3.Lerp(normal0, normal1, coef0);
Vec3 p02 = Vec3.Lerp(normal0, normal2, coef0);
normal = Vec3.Lerp(p01, p02, coef1);
normal.Normalize();
}
}
//calculate pixel color
ColorValue resultColor = new ColorValue(0, 0, 0);
foreach (MyLight light in lights)
{
//simple culling method. need use grid
if (!light.Bounds.IsContainsPoint(position))
{
continue;
}
//calculate illumination
float illumination = light.GetIllumination(position, normal);
if (illumination <= .00001f)
{
continue;
}
//check for direct visibility
bool shadowed = false;
if (calculateShadows)
{
Ray ray = light.GetCheckVisibilityRay(position);
RayCastResult result = physicsScene.RayCast(ray, contactGroup);
if (result.Shape != null)
{
shadowed = true;
}
}
ColorValue color = light.DiffuseColor * illumination;
if (shadowed)
{
color *= new ColorValue(1, 1, 1) - shadowColor;
}
resultColor += color;
}
resultColor.Alpha = 1;
return(resultColor);
}