and when view direction becomes this =>
I want to get just the exterior silhouette(contour), like this =>
and this =>
I study some algorithms of NPR, but I don't want to just render the exterior silhouette, I want to know exactly what is exterior silhouette during program run time. For example, if "some condition satisfy", I can judge it is exterior silhouette.
Hope someone could help me, thanks a lot!!! :)
cavatina
Quote:Original post by 51mon
I think this would work:
* Render the object to a texture, in a way that the whole object has the same color.
* Mipmap the texture.
* Compare the colors from two diffrent levels, level 0 and some other. With higher level, thicker boarder.
* Render screen quad, if the colors is diffrent and neighter is black, render boarder color.
* Blend boarder with the backbuffer.
For best performance, use a shader. There is a variant of this where you use a normal map in the first step but that one create interior edges to. If you have many objects that you want to render boarder to at the same time you could use many colors, with RGBA you could render 4 boarders and you could probably divide it further with some brainwork:)
Quote:Original post by cavatina
...I don't want to just render the exterior silhouette, I want to know exactly what is exterior silhouette...
Quote:
Uhhh...
No,
He wants to actually calculate the silhouette for use in game logic (probably shadow volumes or something). Not just render it as a graphics post-process effect.
