GL_shadow

An implementation of the stencil shadow volume technique.

This is a little more complex demo, which required studying Blender Python OBJ importer,
NeHe's lesson 27 and some other docs about shadow volume technique.
Actually the demo is a merge of an OBJ loader and some code for real-time shadow generation using
the depth pass test (zpass).

http://encelo.netsons.org/programming/opengl

Category:

Science & Technology

Tags:

• sdl
• opengl
• stencil
• shadow
• volume
• 3d
• real-time
• demo

[encelo]

Cannot remember which Blender version precisely, it was three years ago.

Have a look at release logs. ;-)

By the way, my recent demos have a PLY importer, try integrating that one into this demo. :-)

[superkellerman8D]

It won't load any other models made in blender other than the two you have already supplied.

[encelo]

@superkellerman8D The demo is based on the old OBJ exporter which seems to be quite incompatible with the new one. :-)

[spider853]

Can it be implemented in real game with many polygons and details? becouse if i dont mistake the NeHe tutorial is about stencil projected shadows

[encelo]

Well, it's the same technique used in Id Tech 4 (Doom 3, Quake 4).

But it seems that nowadays it's shadow mapping the winner technique for real-time shadow generation.

[DeltaSpeeds]

Is this for the Blender Game Engine?

[encelo]

No, this a plain C demo using OpenGL.

Blender has been used only for objects creation, if you download the source you'll notice there is also a Suzanne model already exported and available for use in this demo.

[superkellerman8D]

@encelo what blender version?

[superkellerman8D]

If I may offer a suggestion- loop through each individual light and only stencil out that light source. This will give a different color for each shadow, and it is more realistic. More like doom 3.