TEXMAP extension thoughts and findings.

[Roland Melkert]

Again, how does LDCad work currently? I'll ask Leo to mirror that work, and if the only two working examples are out of spec, at least they will be consistent.

I've checked the sourcecode as it has been along time since I touched that part of the code, and it seems I'm using p3 at the same level as p1. But revisiting this now makes me want to change that (I'm about to release 1.6b anyway) to follow the spec and just invert the texcoord distance instead.

Current source of interest:

Code:

TLDCylindricalTextureInfo::TLDCylindricalTextureInfo(TGL2DTexture *tex, const TGLVector3d &p1, const TGLVector3d &p2, const TGLVector3d &p3, const double angle) :
 inherited(tex),
 topCen(p1), botCen(p2), nor(p1-p2), restDir(p3-p1),
 angle(deg2Rad(angle)), angleIs360(angle>=360.0 || angle<=-360.0) {

 nor.normalize(len);
 restDir.normalize();
};

void TLDCylindricalTextureInfo::calcUV(TGLVector3f **pnts, const int pntCnt, TGLVector2f *uv) {

 //Alles via vec3d tbv rounding errors
 TGLVector3d baseDir(false), curDir(false), pnt(false);
 double baseAngle(0.0), curAngle;

 for (int i=0; i<pntCnt; i++)
 {
   pnt.init(*pnts[i]);
   TGLVector2f &tc=uv[i];

   pnt.calcDirectionTo(botCen, nor, curDir);
   curDir.inverse(); //moet van midden naar buiten net als restDir

   curAngle=nor.calcSignedAngleBetween(curDir, i==0 ? restDir : baseDir);
   if (i==0)
   {
     baseDir=curDir;
     baseAngle=curAngle;
   }
   else
     curAngle+=baseAngle;

   tc.u=0.5+curAngle/angle;
   tc.v=distanceToPlane(pnt, nor, topCen, nor)/len; //afst tot top
 }
};

edit: A change isn't a big deal imho as officially the cyl/sph implementations in LDCad are still 'experimental'