public void BeginDraw_Ray(Ray3f ray, AnyRayHit rayHit, int nStep)
{
CreateNewPrimitive();
Vector3f hitPos = rayHit.hitPos;
Frame3f sceneW = scene.SceneFrame;
if (rayHit.hitSO == null)
{
primStartW = sceneW;
primStartW.Origin = hitPos;
}
else
{
if (scene.Context.TransformManager.ActiveFrameType == FrameType.WorldFrame)
{
primStartW = sceneW;
primStartW.Origin = hitPos;
}
else if (rayHit.hitSO is PivotSO)
{
primStartW = (rayHit.hitSO as PivotSO).GetLocalFrame(CoordSpace.WorldCoords);
primStartW.Origin = hitPos;
}
else if (rayHit.hitSO is PrimitiveSO)
{
// align with object frame as much as possible, given that we still want
// to use hit normal...
Frame3f objFrame = (rayHit.hitSO as PrimitiveSO).GetLocalFrame(CoordSpace.WorldCoords);
int nBestAxis = MathUtil.MostParallelAxis(objFrame, rayHit.hitNormal);
int nPerp = (nBestAxis + 1) % 3;
primStartW = new Frame3f(hitPos, rayHit.hitNormal, 1);
primStartW.ConstrainedAlignAxis(0, objFrame.GetAxis(nPerp), primStartW.Y);
}
else
{
primStartW = new Frame3f(hitPos, rayHit.hitNormal, 1);
primStartW.ConstrainedAlignAxis(1, sceneW.Y, primStartW.Y);
}
}
primitive.Frame = primStartW;
primStartS = scene.ToSceneFrame(primStartW);
}
