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Octahedral Normal/Tangent Compression

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Implementation of Octahedral normal compression into Godot 4.0
This commit is contained in:
Omar El Sheikh
2022-02-22 18:10:09 -05:00
parent f2a6168414
commit 78881b3cc3
7 changed files with 112 additions and 137 deletions
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16
core/math/vector3.cpp
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@@ -117,6 +117,22 @@ Vector3 Vector3::octahedron_decode(const Vector2 &p_oct) {
return n.normalized();
}
Vector2 Vector3::octahedron_tangent_encode(const float sign) const {
Vector2 res = this->octahedron_encode();
res.y = res.y * 0.5f + 0.5f;
res.y = sign >= 0.0f ? res.y : 1 - res.y;
return res;
}
Vector3 Vector3::octahedron_tangent_decode(const Vector2 &p_oct, float *sign) {
Vector2 oct_compressed = p_oct;
oct_compressed.y = oct_compressed.y * 2 - 1;
*sign = oct_compressed.y >= 0.0f ? 1.0f : -1.0f;
oct_compressed.y = Math::abs(oct_compressed.y);
Vector3 res = Vector3::octahedron_decode(oct_compressed);
return res;
}
Basis Vector3::outer(const Vector3 &p_with) const {
Vector3 row0(x * p_with.x, x * p_with.y, x * p_with.z);
Vector3 row1(y * p_with.x, y * p_with.y, y * p_with.z);