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Improved the code that computes the (u, v) coordinates for a triangle vertices.

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This commit is contained in:
Irlan 2019-06-28 14:53:09 -03:00
parent cc5d062ca5
commit 55c4f190b1
1 changed files with 11 additions and 8 deletions
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19
src/bounce/cloth/cloth.cpp
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@ -150,27 +150,30 @@ b3Cloth::b3Cloth(const b3ClothDef& def) :
triangle->m_aabbProxy.owner = triangle; triangle->m_aabbProxy.owner = triangle;
triangle->m_broadPhaseId = m_contactManager.m_broadPhase.CreateProxy(aabb, &triangle->m_aabbProxy); triangle->m_broadPhaseId = m_contactManager.m_broadPhase.CreateProxy(aabb, &triangle->m_aabbProxy);
// uv coordinates for triangle b3Vec3 AB = B - A;
b3Vec3 AC = C - A;
// v1 // v1
b3Vec2 uv1; b3Vec2 uv1;
uv1.SetZero(); uv1.SetZero();
// v2 // v2
b3Vec3 AB = B - A;
b3Vec2 uv2; b3Vec2 uv2;
uv2.x = b3Length(AB); uv2.x = b3Length(AB);
uv2.y = 0.0f; uv2.y = 0.0f;
// v3 // v3
b3Vec3 n_AB = b3Normalize(AB); B3_ASSERT(uv2.x > 0.0f);
b3Vec3 AC = C - A; b3Vec3 n_AB = AB / uv2.x;
float32 len_AC = b3Length(AC);
// A = b * h / 2
// h = (A * 2) / b
float32 A2 = b3Length(b3Cross(AB, AC));
B3_ASSERT(A2 > 0.0f);
b3Vec2 uv3; b3Vec2 uv3;
uv3.x = b3Dot(n_AB, AC); uv3.x = b3Dot(n_AB, AC);
uv3.y = b3Sqrt(len_AC * len_AC - uv3.x * uv3.x); uv3.y = A2 / uv2.x;
// Strech matrix // Strech matrix
float32 du1 = uv2.x - uv1.x; float32 du1 = uv2.x - uv1.x;