Editing Darkplaces lighting/Lighting model
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* Color Map : base texture (best way to use [[diffuse]] texture) | * Color Map : base texture (best way to use [[diffuse]] texture) | ||
* Normal Map : texture storing additional surface curvature (optionally, alpha storing height) | * Normal Map : texture storing additional surface curvature (optionally, alpha storing height) | ||
| − | * Gloss Map : texture used for specular | + | * Gloss Map : texture used for specular and containing gloss color (RGB) and optional exponent multiplier (alpha) |
* Glow Map : texture's local luminance texture, RGB additive blended texture that entirely ignores shading | * Glow Map : texture's local luminance texture, RGB additive blended texture that entirely ignores shading | ||
* Light Vector : vector of light direction (either calculated for realtime light or got from deluxemap [[lightmap]] component) | * Light Vector : vector of light direction (either calculated for realtime light or got from deluxemap [[lightmap]] component) | ||
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{{important|Shadows are quite complex render task, many lights casting many shadows may decrease rendering speed significantly. Map designer should plan his map with this limitation in mind - there should be no situation of many lights being seen from a certain point, or user will experience a game slowdown.}} | {{important|Shadows are quite complex render task, many lights casting many shadows may decrease rendering speed significantly. Map designer should plan his map with this limitation in mind - there should be no situation of many lights being seen from a certain point, or user will experience a game slowdown.}} | ||
| − | Darkplaces supports two realtime shadowing techniques | + | Darkplaces supports two realtime shadowing techniques. |
| − | ===Stencil | + | ===Stencil shadows=== |
[http://en.wikipedia.org/wiki/Shadow_volume Stencil shadow volumes] is a base shadow rendering method in Darkplaces. | [http://en.wikipedia.org/wiki/Shadow_volume Stencil shadow volumes] is a base shadow rendering method in Darkplaces. | ||
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{{cvar|r_showshadows|Show areas covered by shadow volumes. Useful for finding out why some areas of the map render slowly <nowiki>(bright blue = lots of passes, slow)</nowiki>. Only matters if using shadow volumes.}} | {{cvar|r_showshadows|Show areas covered by shadow volumes. Useful for finding out why some areas of the map render slowly <nowiki>(bright blue = lots of passes, slow)</nowiki>. Only matters if using shadow volumes.}} | ||
| − | === | + | ===Shadowmapping=== |
| − | + | Since 2010 [http://en.wikipedia.org/wiki/Shadow_mapping shadow mapping] was implemented by [http://sauerbraten.org/ Eihrul]. | |
Shadowmapping have a number of advantages over shadow volume rendering and is considered to replace it: | Shadowmapping have a number of advantages over shadow volume rendering and is considered to replace it: | ||
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* Takes less CPU time (as construction of shadow volumes is not required) | * Takes less CPU time (as construction of shadow volumes is not required) | ||
* Distance-based LOD (far lights rendered with lower shadowmap resolution) | * Distance-based LOD (far lights rendered with lower shadowmap resolution) | ||
| + | * Shadow edges are not sharp | ||
{{hidden begin|Console variables}} | {{hidden begin|Console variables}} | ||
| − | {{cvar|r_shadow_shadowmapping|Enables | + | {{cvar|r_shadow_shadowmapping|Enables shadowmapping}} |
{{cvar|r_shadow_shadowmapping|Shadowmap [[bias]] parameter (this is multiplied by nearclip * 1024 / lodsize}} | {{cvar|r_shadow_shadowmapping|Shadowmap [[bias]] parameter (this is multiplied by nearclip * 1024 / lodsize}} | ||
{{cvar|r_shadow_shadowmapping_bordersize|Shadowmap size bias for filtering}} | {{cvar|r_shadow_shadowmapping_bordersize|Shadowmap size bias for filtering}} | ||
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{{cvar|r_shadow_shadowmapping_minsize|Shadowmap size limit}} | {{cvar|r_shadow_shadowmapping_minsize|Shadowmap size limit}} | ||
{{cvar|r_shadow_shadowmapping_nearclip|Shadowmap near clip in world units. Increasing this will make shadow rendering to be more precise (as more bits goes to middle range), at the cost of the small non-shadowed zone around light}} | {{cvar|r_shadow_shadowmapping_nearclip|Shadowmap near clip in world units. Increasing this will make shadow rendering to be more precise (as more bits goes to middle range), at the cost of the small non-shadowed zone around light}} | ||
| − | {{cvar|r_shadow_shadowmapping_polygonfactor|Slope-dependent | + | {{cvar|r_shadow_shadowmapping_polygonfactor|Slope-dependent shadowmapping bias}} |
| − | {{cvar|r_shadow_shadowmapping_polygonoffset|Constant | + | {{cvar|r_shadow_shadowmapping_polygonoffset|Constant shadowmapping bias}} |
{{cvar|r_shadow_shadowmapping_precision|Makes shadowmaps have a maximum resolution of this number of pixels per light source radius unit such that, for example, at precision 0.5 a light with radius 200 will have a maximum resolution of 100 pixels}} | {{cvar|r_shadow_shadowmapping_precision|Makes shadowmaps have a maximum resolution of this number of pixels per light source radius unit such that, for example, at precision 0.5 a light with radius 200 will have a maximum resolution of 100 pixels}} | ||
{{cvar|r_shadow_shadowmapping_useshadowsampler|whether to use sampler2DShadow if available}} | {{cvar|r_shadow_shadowmapping_useshadowsampler|whether to use sampler2DShadow if available}} | ||
