I'm using a billboard-type system for creating the illusion of an outer-glow on some spherical objects in my game.
These are just single models rendered with the basic effect (which seems to handle transparency just fine). However, as soon as I start rendering about 10+ of them, this seems to create a huge lag in my game speed.
Anyone got any ideas/solutions? Wasn't sure what further info I should provide, it doesn't seem to be dependent on the rest of my code at all.
Thanks in advance.
When this happens, there are usually two issues:
1. Fillrate - reduce the resolution of the texture. Make sure it has mipmaps.
2. Batching of draw calls. Make sure you render as many as possible in a single draw call (e.g. do not render 500 quad with 500 draw calls)
What platform / HW are testing it on ?
I'm using a billboard-type system for creating the illusion of an outer-glow on some spherical objects in my game.
are your "billboards" spheres around the objects, or quads in front of the object?
if spheres, do they have a large number of faces? or are they low poly, like 8 faces around a circle?
are they alpha tested, or alpha blended?
whats your texture size?
Draw your alpha blended objects at the end of the frame, I don't forget to turn off alpha bleding when you're drawing non alpha-blended objects!
Tip :
- Try to use clip() function in the pixel shader
- Check the num of triangles in your meshes
- check your texture dimensions (and mip levels)
- batch the scene : Try to bind each texture only once(or something near that) per frame. If you are binding textures very often you WILL slow the whole process down!
- Try to bind each vertex/index buffer only once(well it not that possible)
- The try to use IMMUTABLE BUFFERS
