public void generateNormalsTangentsBinormals() {
this.mTangentsBinormals =
FloatBuffer.allocate(this.mVertices.capacity() / D3DMesh.nbFloatPerVertex * 6);
int trianglecount = this.mIndices.capacity() / 3;
this.mIndices.position(0);
D3DVector normal = new D3DVector();
D3DVector tangent = new D3DVector();
D3DVector binormal = new D3DVector();
D3DVector2f texCoords0 = new D3DVector2f();
D3DVector2f texCoords1 = new D3DVector2f();
D3DVector2f texCoords2 = new D3DVector2f();
D3DVector vm1 = new D3DVector();
D3DVector vm2 = new D3DVector();
D3DVector2f t1 = new D3DVector2f();
D3DVector2f t2 = new D3DVector2f();
D3DVector v0 = new D3DVector();
D3DVector v1 = new D3DVector();
D3DVector v2 = new D3DVector();
float coef;
for (int i = 0; i < trianglecount; i++) {
int a, b, c;
a = this.mIndices.get();
b = this.mIndices.get();
c = this.mIndices.get();
v0.setFromVertice(this.mVertices, a);
v1.setFromVertice(this.mVertices, b);
v2.setFromVertice(this.mVertices, c);
texCoords0.setFromTexCoords(this.mVertices, a);
texCoords1.setFromTexCoords(this.mVertices, b);
texCoords2.setFromTexCoords(this.mVertices, c);
D3DVector.sub(vm1, v1, v0);
D3DVector.sub(vm2, v2, v0);
D3DVector2f.sub(t1, texCoords1, texCoords0);
D3DVector2f.sub(t2, texCoords2, texCoords0);
vm1.normalize();
vm2.normalize();
t1.normalize();
t2.normalize();
coef = 1 / (t1.getX() * t2.getY() - t2.getX() * t1.getY());
tangent.set(0, coef * (vm1.get(0) * t2.getY() + vm2.get(0) * -t1.getY()));
tangent.set(1, coef * (vm1.get(1) * t2.getY() + vm2.get(1) * -t1.getY()));
tangent.set(2, coef * (vm1.get(2) * t2.getY() + vm2.get(2) * -t1.getY()));
tangent.normalize();
normal.setFromNormal(this.mVertices, a);
D3DVector.cross(binormal, normal, tangent);
binormal.normalize();
addTangent(
a,
getTangent(a, 0) + tangent.get(0),
getTangent(a, 1) + tangent.get(1),
getTangent(a, 2) + tangent.get(2));
addBinormal(
a,
getBinormal(a, 0) + binormal.get(0),
getBinormal(a, 1) + binormal.get(1),
getBinormal(a, 2) + binormal.get(2));
D3DVector.sub(vm1, v2, v1);
D3DVector.sub(vm2, v0, v1);
D3DVector2f.sub(t1, texCoords2, texCoords1);
D3DVector2f.sub(t2, texCoords0, texCoords1);
vm1.normalize();
vm2.normalize();
t1.normalize();
t2.normalize();
coef = 1 / (t1.getX() * t2.getY() - t2.getX() * t1.getY());
tangent.set(0, coef * (vm1.get(0) * t2.getY() + vm2.get(0) * -t1.getY()));
tangent.set(1, coef * (vm1.get(1) * t2.getY() + vm2.get(1) * -t1.getY()));
tangent.set(2, coef * (vm1.get(2) * t2.getY() + vm2.get(2) * -t1.getY()));
tangent.normalize();
normal.setFromNormal(this.mVertices, b);
D3DVector.cross(binormal, normal, tangent);
binormal.normalize();
addTangent(
b,
getTangent(b, 0) + tangent.get(0),
getTangent(b, 1) + tangent.get(1),
getTangent(b, 2) + tangent.get(2));
addBinormal(
b,
getBinormal(b, 0) + binormal.get(0),
getBinormal(b, 1) + binormal.get(1),
getBinormal(b, 2) + binormal.get(2));
D3DVector.sub(vm1, v0, v2);
D3DVector.sub(vm2, v1, v2);
D3DVector2f.sub(t1, texCoords0, texCoords2);
D3DVector2f.sub(t2, texCoords1, texCoords2);
vm1.normalize();
vm2.normalize();
t1.normalize();
t2.normalize();
coef = 1 / (t1.getX() * t2.getY() - t2.getX() * t1.getY());
tangent.set(0, coef * (vm1.get(0) * t2.getY() + vm2.get(0) * -t1.getY()));
tangent.set(1, coef * (vm1.get(1) * t2.getY() + vm2.get(1) * -t1.getY()));
tangent.set(2, coef * (vm1.get(2) * t2.getY() + vm2.get(2) * -t1.getY()));
tangent.normalize();
normal.setFromNormal(this.mVertices, c);
D3DVector.cross(binormal, normal, tangent);
binormal.normalize();
addTangent(
c,
getTangent(c, 0) + tangent.get(0),
getTangent(c, 1) + tangent.get(1),
getTangent(c, 2) + tangent.get(2));
addBinormal(
c,
getBinormal(c, 0) + binormal.get(0),
getBinormal(c, 1) + binormal.get(1),
getBinormal(c, 2) + binormal.get(2));
}
D3DVector tmp = new D3DVector();
for (int i = 0; i < this.mTangentsBinormals.capacity() / 6; i++) {
tmp.set(0, this.mTangentsBinormals.get(i * 6));
tmp.set(1, this.mTangentsBinormals.get(i * 6 + 1));
tmp.set(2, this.mTangentsBinormals.get(i * 6 + 2));
tmp.normalize();
this.mTangentsBinormals.put(i * 6 + 0, tmp.get(0));
this.mTangentsBinormals.put(i * 6 + 1, tmp.get(1));
this.mTangentsBinormals.put(i * 6 + 2, tmp.get(2));
tmp.set(0, this.mTangentsBinormals.get(i * 6 + 3));
tmp.set(1, this.mTangentsBinormals.get(i * 6 + 4));
tmp.set(2, this.mTangentsBinormals.get(i * 6 + 5));
tmp.normalize();
this.mTangentsBinormals.put(i * 6 + 3, tmp.get(0));
this.mTangentsBinormals.put(i * 6 + 4, tmp.get(1));
this.mTangentsBinormals.put(i * 6 + 5, tmp.get(2));
}
mergeTangents();
this.mIndices.position(0);
this.mTangentsBinormals.position(0);
}
