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39 行
1.4 KiB
39 行
1.4 KiB
UNITY_INSTANCING_BUFFER_START(Terrain)
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UNITY_DEFINE_INSTANCED_PROP(float4, _TerrainPatchInstanceData) // float4(xBase, yBase, skipScale, ~)
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UNITY_INSTANCING_BUFFER_END(Terrain)
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AttributesMesh ApplyMeshModification(AttributesMesh input)
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{
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#ifdef UNITY_INSTANCING_ENABLED
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float2 patchVertex = input.positionOS.xy;
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float4 instanceData = UNITY_ACCESS_INSTANCED_PROP(Terrain, _TerrainPatchInstanceData);
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float2 sampleCoords = (patchVertex.xy + instanceData.xy) * instanceData.z; // (xy + float2(xBase,yBase)) * skipScale
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float height = UnpackHeightmap(_TerrainHeightmapTexture.Load(int3(sampleCoords, 0)));
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input.positionOS.xz = sampleCoords * _TerrainHeightmapScale.xz;
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input.positionOS.y = height * _TerrainHeightmapScale.y;
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#ifdef ATTRIBUTES_NEED_NORMAL
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input.normalOS = _TerrainNormalmapTexture.Load(int3(sampleCoords, 0)).rgb * 2 - 1;
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#endif
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#if defined(VARYINGS_NEED_TEXCOORD0) || defined(VARYINGS_DS_NEED_TEXCOORD0)
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#ifdef ENABLE_TERRAIN_PERPIXEL_NORMAL
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input.uv0 = sampleCoords;
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#else
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input.uv0 = sampleCoords * _TerrainHeightmapRecipSize.zw;
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#endif
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#endif
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#endif
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#ifdef ATTRIBUTES_NEED_TANGENT
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input.tangentOS.xyz = cross(float3(0,0,1), input.normalOS);
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input.tangentOS.w = 1;
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#endif
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return input;
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}
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void ApplyVertexModification(AttributesMesh input, float3 normalWS, inout float3 positionWS, float4 time)
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{
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}
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