|
|
@@ -546,22 +546,22 @@ A technique definition looks like this:
|
|
|
</technique>
|
|
|
\endcode
|
|
|
|
|
|
-The passes are:
|
|
|
+The purposes of the different passes are:
|
|
|
|
|
|
-- base: renders the ambient light, per-vertex lights and fog.
|
|
|
-- litbase: renders the first per-pixel light, ambient light and fog. This is an optional pass for optimization.
|
|
|
-- light: renders one per-pixel light's contribution additively.
|
|
|
-- prealpha: custom rendering pass after opaque geometry. Can be used for example to render the skybox.
|
|
|
-- postalpha: custom rendering pass after transparent geometry.
|
|
|
-- gbuffer: (light pre-pass only) renders normals, specular power and depth to prepare for opaque geometry light accumulation.
|
|
|
-- material: (light pre-pass only) renders the opaque geometry final color by combining ambient light, per-vertex lights and per-pixel light accumulation.
|
|
|
-- shadow: renders depth only for shadow map generation.
|
|
|
+- base: Renders ambient light, per-vertex lights and fog.
|
|
|
+- litbase: Renders the first per-pixel light, ambient light and fog. This is an optional pass for optimization.
|
|
|
+- light: Renders one per-pixel light's contribution additively.
|
|
|
+- prealpha: Custom rendering pass after opaque geometry. Can be used for example to render the skybox.
|
|
|
+- postalpha: Custom rendering pass after transparent geometry.
|
|
|
+- gbuffer: %Light pre-pass only - renders normals, specular power and depth to the G-buffer.
|
|
|
+- material: %Light pre-pass only - renders opaque geometry final color by combining ambient light, per-vertex lights and per-pixel light accumulation.
|
|
|
+- shadow: Renders depth only for shadow map generation.
|
|
|
|
|
|
By default draw calls within passes are sorted by render state, but transparent base and light passes, as well as the postalpha pass, are sorted by distance back to front.
|
|
|
|
|
|
Note that the technique does not need to enumerate shaders used for different geometry types (non-skinned, skinned, instanced, billboard) and different per-vertex and per-pixel light combinations. Instead specific hardcoded shader variations are assumed to exist. See the files Ambient.xml and ForwardLit.xml in either SourceAssets/HLSLShaders or SourceAssets/GLSLShaders to see which variations are required.
|
|
|
|
|
|
-The optional "litbase" pass reduces draw call count by combining ambient light rendering with the first per-pixel light. However, it has intentional limitations to not require too many shader permutations: there must be no vertex lights affecting the object, and the ambient lighting can not have a gradient. In case of excessive overdraw, it is likely better to not define it, but instead allow the computationally light ambient-only pass to initialize the Z buffer for later passes.
|
|
|
+The optional "litbase" pass reduces draw call count by combining ambient lighting with the first per-pixel light affecting an object. However, it has intentional limitations to not require too many shader permutations: there must be no vertex lights affecting the object, and the ambient lighting can not have a gradient. In case of excessive overdraw, it is possibly better not to define it, but instead allow the base pass (which is computationally very lightweight) to run first, initializing the Z buffer for later passes.
|
|
|
|
|
|
|
|
|
\page Lights Lights and shadows
|
Lasse Öörni