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heightfield processAllTriangles: Copy 1 less vertex

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The 2 triangles of a heightfield quad share 2 vertices.

Co-authored-by: Andrew Shulaev <ash.drone@gmail.com>
This commit is contained in:
Gleb Mazovetskiy
2021-02-28 15:15:07 +00:00
parent 48514d038b
commit 782f14caa1
1 changed files with 14 additions and 9 deletions
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23
src/BulletCollision/CollisionShapes/btHeightfieldTerrainShape.cpp
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@@ -349,27 +349,32 @@ void btHeightfieldTerrainShape::processAllTriangles(btTriangleCallback* callback
if (m_flipQuadEdges || (m_useDiamondSubdivision && !((j + x) & 1)) || (m_useZigzagSubdivision && !(j & 1)))
{
//first triangle
getVertex(x, j, vertices[indices[0]]);
getVertex(x, j + 1, vertices[indices[1]]);
getVertex(x + 1, j + 1, vertices[indices[2]]);
callback->processTriangle(vertices, 2 * x, j);
//second triangle
// getVertex(x,j,vertices[0]);//already got this vertex before, thanks to Danny Chapman
getVertex(x + 1, j + 1, vertices[indices[1]]);
// already set: getVertex(x, j, vertices[indices[0]])
// equivalent to: getVertex(x + 1, j + 1, vertices[indices[1]]);
vertices[indices[1]] = vertices[indices[2]];
getVertex(x + 1, j, vertices[indices[2]]);
callback->processTriangle(vertices, 2 * x+1, j);
}
else
{
//first triangle
getVertex(x, j, vertices[indices[0]]);
getVertex(x, j + 1, vertices[indices[1]]);
getVertex(x + 1, j, vertices[indices[2]]);
callback->processTriangle(vertices, 2 * x, j);
//second triangle
getVertex(x + 1, j, vertices[indices[0]]);
//getVertex(x,j+1,vertices[1]);
// already set: getVertex(x, j + 1, vertices[indices[1]]);
// equivalent to: getVertex(x + 1, j, vertices[indices[0]]);
vertices[indices[0]] = vertices[indices[2]];
getVertex(x + 1, j + 1, vertices[indices[2]]);
callback->processTriangle(vertices, 2 * x+1, j);
}
@@ -846,4 +851,4 @@ void btHeightfieldTerrainShape::buildAccelerator(int chunkSize)
void btHeightfieldTerrainShape::clearAccelerator()
{
m_vboundsGrid.clear();
}
}