http://www.gamerendering.com/2009/09/15/particle-geometry/ Tue, 07 Feb 2012 13:10:53 +0000 http://wordpress.org/?v=2.8.5 hourly 1 http://www.gamerendering.com/2009/09/15/particle-geometry/comment-page-1/#comment-3034 admin Tue, 27 Oct 2009 21:44:33 +0000 http://www.gamerendering.com/?p=669#comment-3034 Thanks for sharing that info. Yes, rendering to a texture smaller than screen size is a trick used more and more now. I will probably write an article about it and what filters can be used to upsample the texture (if needed). Thanks for sharing that info. Yes, rendering to a texture smaller than screen size is a trick used more and more now. I will probably write an article about it and what filters can be used to upsample the texture (if needed).

]]> http://www.gamerendering.com/2009/09/15/particle-geometry/comment-page-1/#comment-3032 John Watkins Tue, 27 Oct 2009 17:02:16 +0000 http://www.gamerendering.com/?p=669#comment-3032 Humus has a great article on automated generation of best fit geometry for particle textures to reduce overdraw (http://www.humus.name/index.php?ID=266). Another great way to reduce overdraw is render particles to a lower resolution render target using a downsampled depth buffer, and composite this with the main scene. This chapter from gpu gems 3 (http://http.developer.nvidia.com/GPUGems3/gpugems3_ch23.html) contains details on doing this, although the stencil-masking/high res step is often not needed/worth it for the performance cost. Humus has a great article on automated generation of best fit geometry for particle textures to reduce overdraw (http://www.humus.name/index.php?ID=266). Another great way to reduce overdraw is render particles to a lower resolution render target using a downsampled depth buffer, and composite this with the main scene. This chapter from gpu gems 3 (http://http.developer.nvidia.com/GPUGems3/gpugems3_ch23.html) contains details on doing this, although the stencil-masking/high res step is often not needed/worth it for the performance cost.

]]> http://www.gamerendering.com/2009/09/15/particle-geometry/comment-page-1/#comment-2905 Johannes Spohr Tue, 15 Sep 2009 14:31:21 +0000 http://www.gamerendering.com/?p=669#comment-2905 When using point sprites, the GPU generates texture coords for you. You can modify those in the vertex shader, so you don't have to use a fragment shader. You can also use texture matrices for rotations, but then you get the same rotation for every point sprite. When using point sprites, the GPU generates texture coords for you. You can modify those in the vertex shader, so you don’t have to use a fragment shader. You can also use texture matrices for rotations, but then you get the same rotation for every point sprite.

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