OpenGL - shadow maps (for directional lights) 

Hi linux pingu

@@retroscooter2119 hi to you too.

@@Vagelis_Prokopiou yo

Self-shadowing of a model without constructing a shadow map or shadow volume? Only other option I'm aware of is ray-casting.

@@briantwill I heard/read about a game engine, which does the shadow calculations on the CPU. It projects each triangle onto other triangles, it splits each triangle into dark and light triangles and simply sends these to the GPU and renders these. No shaders needed. I think this was done years ago, before shaders even were added to OpenGL. But I forgot where I heard/read about it and how the engine was called

@@cmdlp4178 Huh, that kinda sounds like shadow volumes, but probably less efficient. Doesn't seem like it would scale well for today's typical triangle counts.

@@briantwill this could be a good topic for a video

Do you create a debug rendering context? It helps, a lot, with that kind of issue. If it goes nuts, most likely there is a call with an invalid parameter somewhere, a properly initialized debug context will report it. Really check your matrix code, make sure you are transposing or not, as appropriate. Vector multiplication with a matrix is not commutative, the order of multiplication makes a huge difference.

It's because of the fragments that extend beyond the frustum of the orthographic projection.