generating quadric surfaces

• To: visad-list@xxxxxxxxxxxxx
• Subject: generating quadric surfaces
• From: John Yao <johnyao@xxxxxxxx>
• Date: Fri, 21 Jun 2002 11:27:53 -0500

Hi All,

for(int i=0;i<resol+1;i++)
        {
            thelta = thelta_gap*i+start;

            for(int j=0;j<resol+1;j++)
            {
                phi = phi_gap*j;

                dx = Math.sin(thelta)*Math.cos(phi);
                dy = Math.cos(thelta);
                dz = Math.sin(thelta)*Math.sin(phi);

                Sn = dx*dx*stress[1]+dy*dy*stress[0]+
                
dz*dz*stress[2]+2.*(dx*dy*stress[3]+dy*dz*stress[4]+dx*dz*stress[5]);

                if(Sn<=0.) tempVal = 0.;
                else tempVal = Math.sqrt(k*k/Math.abs(Sn));
                xCoord[counter] = (float)(tempVal*dx);
                yCoord[counter] = (float)(tempVal*dy);
                zCoord[counter] = (float)(tempVal*dz);

            }
                xCoord[counter] = xCoord[counter-resol];
                yCoord[counter] = yCoord[counter-resol];
                zCoord[counter] = zCoord[counter-resol];
                counter++;
        }

Does anyone have some ideas on how I can fix this problem?  Thanks very much.

john

• Follow-Ups:
  • Re: generating quadric surfaces
    • From: Bill Hibbard