//-----------------------------------------------------------------------------
// Copies the texture coordinate system from pFrom into pTo. Then it rotates
// the texture around the edge until it's as close to pTo's normal as possible.
//-----------------------------------------------------------------------------
void CFaceEditMaterialPage::CopyTCoordSystem( const CMapFace *pFrom, CMapFace *pTo )
{
Vector axis[2], vEdge, vEdgePt, vOrigin;
Vector vFromPt, vNextFromPt;
Vector vToPt, vPrevToPt;
Vector vTestTextureNormal, vTextureNormal;
VMatrix mEdgeRotation, mOriginRotation, mTranslation;
float fAngle, fDot;
bool bRotate;
float fShift[2];
Vector vProjTexNormal;
Vector vProjPolyNormal;
// The edge vector lies on both planes.
vEdge = pFrom->plane.normal.Cross(pTo->plane.normal);
VectorNormalize( vEdge );
// To find a point on the plane, we make a plane from the edge vector and find the intersection
// between the three planes (without the third plane, there are an infinite number of solutions).
if( PlaneIntersection( VPlane(pFrom->plane.normal, pFrom->plane.dist),
VPlane(pTo->plane.normal, pTo->plane.dist),
VPlane(vEdge, 0.0f), vEdgePt ) )
{
bRotate = true;
}
else
{
// Ok, in this case, the planes are parallel so we don't need to rotate around the edge anyway!
bRotate = false;
}
// Copy the texture coordinate system.
axis[0] = pFrom->texture.UAxis.AsVector3D();
axis[1] = pFrom->texture.VAxis.AsVector3D();
fShift[0] = pFrom->texture.UAxis[3];
fShift[1] = pFrom->texture.VAxis[3];
vOrigin = axis[0]*fShift[0]*pFrom->texture.scale[0] + axis[1]*fShift[1]*pFrom->texture.scale[1];
vTextureNormal = axis[0].Cross(axis[1]);
VectorNormalize(vTextureNormal);
if(bRotate)
{
// Project texture normal and poly normal into the plane of rotation
// to get the angle between them.
vProjTexNormal = vTextureNormal - vEdge * vEdge.Dot(vTextureNormal);
vProjPolyNormal = pTo->plane.normal - vEdge * vEdge.Dot(pTo->plane.normal);
VectorNormalize( vProjTexNormal );
VectorNormalize( vProjPolyNormal );
fDot = vProjTexNormal.Dot(vProjPolyNormal);
fAngle = (float)(acos(fDot) * (180.0f / M_PI));
if(fDot < 0.0f)
fAngle = 180.0f - fAngle;
// Ok, rotate them for the final values.
mEdgeRotation = SetupMatrixAxisRot(vEdge, fAngle);
axis[0] = mEdgeRotation.ApplyRotation(axis[0]);
axis[1] = mEdgeRotation.ApplyRotation(axis[1]);
// Origin needs translation and rotation to rotate around the edge.
mTranslation = SetupMatrixTranslation(vEdgePt);
mOriginRotation = ~mTranslation * mEdgeRotation * mTranslation;
vOrigin = mOriginRotation * vOrigin;
}
pTo->texture.UAxis.AsVector3D() = axis[0];
pTo->texture.VAxis.AsVector3D() = axis[1];
pTo->texture.UAxis[3] = axis[0].Dot(vOrigin) / pFrom->texture.scale[0];
pTo->texture.VAxis[3] = axis[1].Dot(vOrigin) / pFrom->texture.scale[1];
pTo->NormalizeTextureShifts();
pTo->texture.scale[0] = pFrom->texture.scale[0];
pTo->texture.scale[1] = pFrom->texture.scale[1];
// rotate is only for UI purposes, it doesn't actually do anything.
pTo->texture.rotate = 0.0f;
pTo->CalcTextureCoords();
}
static int vmatrix_SetupMatrixTranslation (lua_State *L) {
lua_pushvmatrix(L, SetupMatrixTranslation(luaL_checkvector(L, 1)));
return 1;
}
