Function to generate mipmaps (or realtime cubemaps in lua)

[shadmar]

Hi

 

Will LE3D have such a functionality so we can have realtime cubemaps done in lua ?

As I understand after reading several posts, we can't do realtime cubemaps in LE2 (lua) because cubemaps generated from FBO doesn't have any mipmaps. (renders black) which ruins my fun

 

Or just the same, will it be possible to do realtime cubemaps in LE3D in lua (without using opengl directly via c++ as klepto2 has done).

 

Don't get me wrong, I like c++ just as much as the next guy, but I like using the editor and have smart lua objects.

[Josh]

The fastest way to do this is to render from one texture to a buffer, halving it each time. This is how downsampling for bloom works. Any downsampling done on the CPU would be far too slow.

 

I don't generally worry about devoting time to stuff for real-time cube mapping because it isn't a feasible technique to begin with. You're talking about rendering the scene 6 extra times.

[Flexman]

semi real-time is better performance wise. Just render one side of the cube each frame. After 6 frames you've done the whole thing. If you make it small enough and ignore shadows and lighting the performance hit is small. And you don't have to render all the renderables, so to speak.

 

All the functions to do this are already present, it just requires some assembly. Someone posted something in the gallery a while back.

[Benton]

So no real time reflections? That's not very good...

[shadmar]

I think at least we should be able to render a cubemap from buffers using lua.

To snapshot an envmap cubemap when needed.

[Benton]

I think at least we should be able to render a cubemap from buffers using lua.

To snapshot an envmap cubemap when needed.

 

+1