public bool IsShadowed(Primitive currentPrimitive, Ray tRayToLight, float fDistanceToLight)
{
// check every other sphere
foreach (Primitive primitive in m_pScene.Primitives)
{
// spheres don't self-shadow
if (primitive == currentPrimitive)
{
continue;
}
// check for intersection
float fDistance;
if (primitive.Intersect(tRayToLight, out fDistance))
{
// check that intersection is not past the light
if (fDistance < fDistanceToLight)
{
return true;
}
}
}
return false;
}
public FloatColour TraceRay(Primitive pIgnorePrimitive, Ray tRay, int nDepth)
{
// check whether we have reached maximum recursion depth
if (nDepth > 6)
{
//return new Colour(0, 0, 0);
return new FloatColour(1);
}
// declare intersection variables
float fClosestIntersectionDistance = float.MaxValue;
Primitive closestIntersectedPrimitive = null;
// loop through all objects in scene
foreach (Primitive primitive in m_pScene.Primitives)
{
// test for intersection
float fDistance;
if (primitive.Intersect(tRay, out fDistance))
{
// check that we are closer than the last intersection
if (fDistance < fClosestIntersectionDistance)
{
// set closest intersection
fClosestIntersectionDistance = fDistance;
closestIntersectedPrimitive = primitive;
}
}
}
// if nothing was intersected, set to background colour
FloatColour tColour = new FloatColour(Color.CornflowerBlue);
if (closestIntersectedPrimitive != null) // test for intersection
{
tColour = closestIntersectedPrimitive.Shade(this,
tRay, fClosestIntersectionDistance, nDepth + 1);
}
tColour = FloatColour.Min(tColour, new FloatColour(1));
// return colour
return tColour;
}
