private Point3d computeWinCoord(
Canvas3D canvas,
RenderAtom ra,
Point2d winCoord,
Point3d objCoord,
Transform3D localToImagePlate) {
// Get local to Vworld transform
RenderMolecule rm = ra.renderMolecule;
if (rm == null) {
// removeRenderAtom() may set ra.renderMolecule to null
// in RenderBin before this renderer thread run.
return null;
}
// MT safe issue: We can't reference ra.renderMolecule below since
// RenderBin thread may set it to null anytime. Use rm instead.
Transform3D lvw = rm.localToVworld[rm.localToVworldIndex[NodeRetained.LAST_LOCAL_TO_VWORLD]];
Point3d clipCoord3 = new Point3d();
clipCoord3.set(objCoord);
Point4d clipCoord4 = new Point4d();
// Transform point from local coord. to clipping coord.
lvw.transform(clipCoord3);
canvas.vworldToEc.transform(clipCoord3);
canvas.projTrans.transform(clipCoord3, clipCoord4);
// clip check in Z
if ((clipCoord4.w <= 0.0) || (clipCoord4.z > clipCoord4.w) || (-clipCoord4.z > clipCoord4.w)) {
return null;
}
double invW = 1.0 / clipCoord4.w;
clipCoord3.x = clipCoord4.x * invW;
clipCoord3.y = clipCoord4.y * invW;
clipCoord3.z = clipCoord4.z * invW;
// Get Vworld to image plate Xform
canvas.getLastVworldToImagePlate(localToImagePlate);
// v' = vwip x lvw x v
// where v' = transformed vertex,
// lvw = local to Vworld Xform
// vwip = Vworld to Image plate Xform
// v = vertex
// Compute composite local to image plate Xform
localToImagePlate.mul(lvw);
// Transform the Raster's position from object to world coordinates
localToImagePlate.transform(objCoord);
// Get the window coordinates of this point
canvas.getPixelLocationFromImagePlate(objCoord, winCoord);
return clipCoord3;
}
