protected virtual UVPlaneData GetUVPlaneData(int triA, int triB)
{
UVPlaneData data = new UVPlaneData();
int iA;
int iB;
int iC1;
int iC2;
GetQuadVertices(triA, triB, out iA, out iB, out iC1, out iC2);
Utils.Assert(iA >= 0 && iB >= 0 && iC1 >= 0 && iC2 >= 0, "GeoSurface.GetUVPlaneData: triA (" + triA + ") and triB (" + triB + ") must have exactly one common side");
Vector3 vA = NormalizePoint(nodes[iA].position);
Vector3 vB = NormalizePoint(nodes[iB].position);
Vector3 vC1 = NormalizePoint(nodes[iC1].position);
Vector3 vC2 = NormalizePoint(nodes[iC2].position);
Plane planeA = new Plane(vA, vC1, vC2);
Plane planeB = new Plane(vB, vC2, vC1);
Vector3 nA = planeA.normal;
Vector3 nB = planeB.normal;
if (Vector3.Dot(nA, vA) < 0f)
{
nA = -nA;
nB = -nB;
}
Vector3 nAB = (nA + nB).normalized;
Vector3 pA = Math3d.ProjectPointOnPlane(nAB, vA, vA, vA);
Vector3 pB = Math3d.ProjectPointOnPlane(nAB, vA, vB, vB);
Vector3 pC1 = Math3d.ProjectPointOnPlane(nAB, vA, vC1, vC1);
Vector3 pC2 = Math3d.ProjectPointOnPlane(nAB, vA, vC2, vC2);
data.normal = nAB;
data.posA = vA;
data.posB = vB;
data.posC1 = vC1;
data.posC2 = vC2;
data.projA = pA;
data.projB = pB;
data.projC1 = pC1;
data.projC2 = pC2;
data.axisC1A = (pC1 - pA).normalized;
data.axisC2A = (pC2 - pA).normalized;
data.distC1A = (pC1 - pA).magnitude;
data.distC2A = (pC2 - pA).magnitude;
return(data);
}
protected override Vector3 GetVertexPositionFromUV(Vector2 uv, int tripairIndex)
{
float u = uv.x;
float v = uv.y;
UVPlaneData uvPlane = uvPlanesData[tripairIndex];
Vector3 pAC1 = Utils.VectorLerpUnclamped(uvPlane.projA, uvPlane.projC1, v);
Vector3 pC2B = Utils.VectorLerpUnclamped(uvPlane.projC2, uvPlane.projB, v);
return(Utils.VectorLerpUnclamped(pAC1, pC2B, u).normalized);
}
protected override Vector2 GetVertexUV(Vector3 position, int tripairIndex)
{
Vector3 p = NormalizePoint(position);
UVPlaneData uvPlane = uvPlanesData[tripairIndex];
Vector3 pP = Math3d.ProjectPointOnPlane(uvPlane.normal, uvPlane.posA, p, p);
float u = Math3d.PointLineDistance(pP, uvPlane.projA, uvPlane.axisC1A) / uvPlane.distC2A;
float v = Math3d.PointLineDistance(pP, uvPlane.projA, uvPlane.axisC2A) / uvPlane.distC1A;
return(new Vector2(u * 1.5f, v * 1.5f)); // i have no idea why 1.5 works
}