Terrain Rendering in Frostbite using Procedural Shader Splatting (Siggraph 2007)

Terrain Rendering in Frostbite using Procedural Shader Splatting Johan Andersson Rendering Architect, EA DICE 2.5

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Battlefield 2 terrain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Color map Detail mask map

Our requirements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Terrain overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Terrain texturing - general idea ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Terrain material requirements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Specialized terrain material shaders ,[object Object],[object Object],[object Object],[object Object],[object Object]

Graph-based surface shaders ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example surface shader graph ,[object Object],[object Object]

Instance shaders ,[object Object],[object Object],[object Object],[object Object],[object Object]

Shader pipeline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Procedural techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Procedural parameters ,[object Object],[object Object],[object Object],[object Object],Normal Height Slope

Normal filtering ,[object Object],[object Object],[object Object],float3 filterNormal(float2 uv, float texelSize, float texelAspect) { float4 h; h[0] = hmap.Sample(bilSampler, uv + texelSize*float2( 0,-1)).r; h[1] = hmap.Sample(bilSampler, uv + texelSize*float2(-1, 0)).r; h[2] = hmap.Sample(bilSampler, uv + texelSize*float2( 1, 0)).r; h[3] = hmap.Sample(bilSampler, uv + texelSize*float2( 0, 1)).r; float3 n; n.z = (h[0] - h[3]) * texelAspect; n.x = (h[1] - h[2]) * texelAspect; n.y = 2; return normalize(n); }

Material masking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Multiple material masks of all types Red = slope-based cliff material Pink = painted dirt material

Mountain material example Only grass material With mountain material Slope Mask (slope scaled & biased)

Painted masks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fields with painted masks

Static sparse mask textures (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source mask Atlas texture

Static sparse mask textures (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Destruction mask (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Crater screenshot Crater mask (point-filtering)

Destruction mask (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Atlas texture Indirection texture

Increasing mask detail ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Photoshop Overlay blend ,[object Object],[object Object],[object Object],float overlayBlend(float base, float value, float opacity) { float a = base < 0.5 ? 2*base*value : 1 - 2*(1-base)*(1-value); return lerp(base, a, opacity); } Base mask from slope Detail mask Overlay blend result

Shader compositing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2 materials (r & g) creating 3 combos due to overlap

Sea/river floor material added

End result. Road decals + minor materials

Terrain rendering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Geometry LOD ,[object Object],[object Object],[object Object],Before Removed

T-junction solution ,[object Object],[object Object],[object Object]

Undergrowth ,[object Object],[object Object],[object Object],[object Object],[object Object]

Undergrowth example No undergrowth With undergrowth

Undergrowth overview (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Undergrowth overview (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Undergrowth generation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Generated mask Normalmap

Undergrowth distribution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Undergrowth rendering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Undergrowth surface shader Shadows on undergrowth

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Future / Ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions? Contact: johan.andersson@dice.se

Terrain Rendering in Frostbite using Procedural Shader Splatting (Siggraph 2007)

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