On Thu, 8 Mar 2001, John Wright wrote:
> Desiree,
>
> Doesn't your right side fold back onto itself? (point 3 to 4 is the
> reverse of 2 to 3) (I didn't look beyond your right side) Thus you
> really didn't create boxes... which of course you don't see until you
> rotate them.
I checked it again, I think it is right. I change the PolgonAttributes
Modus so that I can see only the lines. During rotation the boxes
dissappear and reappear. So it is more likely to be a clipping problem,
right?
>
> As an experiment, if you still suspect a problem with normals, perhaps
> pump your data into a GeometryInfo object and then have it give you
> normals.
It tried that, the effect was the same.
Thanks Desiree
>
> - John Wright
> Starfire Research
>
> Desiree Hilbring wrote:
> >
> > o------------------------------------------------------------------------o
> >
> > On Thu, 8 Mar 2001, Yazel, David J. wrote:
> >
> > > I don't know enough of your app to understand what "looks wrong" to you.. In
> > > the second screenshot there are empty bands in the middle of the box.. is
> > > that what you are referring to?
> >
> > Yes, that is what I was referring to. The overall box is createt from
> > several smaller boxes, each has its own color and some of them are
> > sometimes missing, during rotation
> >
> > If that happened during a rotation I would
> > > suspect the normals were wrong.
> >
> > May be they are, I will thinks about them. Thanks Desiree
> >
> > Thats how I calculate them now:
> >
> > Point3f[] coords = new Point3f[16];
> >
> > // Triangle Strip Array
> > // front
> > coords[0]=new Point3f(eastValue-w,heightValue+c,-northValue+l);
> > coords[1]=new Point3f(eastValue-w,heightValue-c,-northValue+l);
> > coords[2]=new Point3f(eastValue+w,heightValue+c,-northValue+l);
> > coords[3]=new Point3f(eastValue+w,heightValue-c,-northValue+l);
> > // right
> > coords[4]=new Point3f(eastValue+w,heightValue+c,-northValue-l);
> > coords[5]=new Point3f(eastValue+w,heightValue-c,-northValue-l);
> > // back
> > coords[6]=new Point3f(eastValue-w,heightValue+c,-northValue-l);
> > coords[7]=new Point3f(eastValue-w,heightValue-c,-northValue-l);
> >
> > // top
> > coords[8]=new Point3f(eastValue+w,heightValue+c,-northValue+l);
> > coords[9]=new Point3f(eastValue+w,heightValue+c,-northValue-l);
> > coords[10]=new Point3f(eastValue-w,heightValue+c,-northValue+l);
> > coords[11]=new Point3f(eastValue-w,heightValue+c,-northValue-l);
> > // left
> > coords[12]=new Point3f(eastValue-w,heightValue-c,-northValue+l);
> > coords[13]=new Point3f(eastValue-w,heightValue-c,-northValue-l);
> > // down
> > coords[14]=new Point3f(eastValue+w,heightValue-c,-northValue+l);
> > coords[15]=new Point3f(eastValue+w,heightValue-c,-northValue-l);
> >
> > /*
> > for(int j=0;j<coords.length;j++) {
> > System.out.println("c "+j+" "+coords[j]);
> > }
> > */
> >
> > // direkter Fuellversuch
> > // create normals
> > //Vector3f[] normals = new Vector3f[24];
> > //Vector3f[] normals = new Vector3f[36];
> > Vector3f[] normals = new Vector3f[16];
> > for(int n=0;n<normals.length;n=n+4) {
> > Vector3f v1 = new Vector3f();
> > Vector3f v2 = new Vector3f();
> > v1.x = coords[n+3].x - coords[n].x;
> > v2.x = coords[n+1].x - coords[n].x;
> > v1.y = coords[n+3].y - coords[n].y;
> > v2.y = coords[n+1].y - coords[n].y;
> > v1.z = coords[n+3].z - coords[n].z;
> > v2.z = coords[n+1].z - coords[n].z;
> > Vector3f vcross = new Vector3f();
> > vcross.cross(v2,v1);
> > vcross.normalize();
> > normals[n]=vcross;
> > normals[n+1]=vcross;
> > normals[n+2]=vcross;
> > normals[n+3]=vcross;
> > }
> > /*
> > for(int k=0;k<coords.length;k++) {
> > System.out.println("n "+k+" "+normals[k]);
> > }
> > */
> >
> > int stripCounts[] = {8,8};
> > TriangleStripArray tri = new
> > TriangleStripArray(16,TriangleArray.COORDINATES|TriangleArray.NORMALS,stripCounts);
> > tri.setCoordinates(0,coords);
> > tri.setNormals(0,normals);
> > tri.setCapability(Geometry.ALLOW_INTERSECT);
> >
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