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Get face normals rendering

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This commit is contained in:
Eryn Wells 2018-11-20 17:13:31 -07:00
parent f28e6e08df
commit 296af144ce
5 changed files with 90 additions and 41 deletions
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23
Terrain2/Shaders/TerrainAlgorithms.metal
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@ -61,16 +61,23 @@ kernel void updateGeometryHeights(texture2d<float> texture [[texture(GeneratorTe
vertexes[vIdx].y = height.r;
}
kernel void updateGeometryNormals(constant float3 *vertexes [[buffer(GeneratorBufferIndexMeshPositions)]],
constant packed_uint3 *indexes [[buffer(GeneratorBufferIndexIndexes)]],
device packed_float3 *normals [[buffer(GeneratorBufferIndexFaceNormals)]],
kernel void updateGeometryNormals(constant packed_float3 *meshPositions [[buffer(GeneratorBufferIndexMeshPositions)]],
constant packed_ushort3 *indexes [[buffer(GeneratorBufferIndexIndexes)]],
device packed_float3 *faceNormals [[buffer(GeneratorBufferIndexFaceNormals)]],
device packed_float3 *faceMidpoints [[buffer(GeneratorBufferIndexFaceMidpoints)]],
uint tid [[thread_position_in_grid]])
{
const uint3 triIdx = indexes[tid];
float3 side1(vertexes[triIdx.y] - vertexes[triIdx.x]);
float3 side2(vertexes[triIdx.y] - vertexes[triIdx.z]);
float3 normal(normalize(cross(side1, side2)));
normals[tid] = normal;
const ushort3 triangleIndex = indexes[tid];
const float3 v1 = meshPositions[triangleIndex.x];
const float3 v2 = meshPositions[triangleIndex.y];
const float3 v3 = meshPositions[triangleIndex.z];
float3 side1 = v1 - v2;
float3 side2 = v1 - v3;
float3 normal = normalize(cross(side1, side2));
faceNormals[tid] = normal;
faceMidpoints[tid] = 0.3333333333 * (v1 + v2 + v3);
}
kernel void updateGeometryVertexNormals()