hello, basically Im a using poly which isn't unwelded, so there are a lot of shared verts. I was hoping to try and find out which verts were visible to the camera (for a hidden line routine).
Im still new to this cross product / dot product stuff and still getting my head around it. Anyway when I use a dot product to check visibility with the shared verts, it doesnt always work i.e. I can physically see the vert on the screen before dot product is <=0. Maybe Im doing something wrong here?
So my next idea was to use the normals of each of triangle to check their dot products. If they were in view then I could assume that all the verts that go to make up that triangle are also visible (and therefore I wouldnt need to unweld my model).
HHmm I hope its clear? Thanks for you help on this Stevie G :)
Im still new to this cross product / dot product stuff and still getting my head around it. Anyway when I use a dot product to check visibility with the shared verts, it doesnt always work i.e. I can physically see the vert on the screen before dot product is <=0. Maybe Im doing something wrong here?
So my next idea was to use the normals of each of triangle to check their dot products. If they were in view then I could assume that all the verts that go to make up that triangle are also visible (and therefore I wouldnt need to unweld my model).
HHmm I hope its clear? Thanks for you help on this Stevie G :)