- // Spiral tube
-// double vX, vY, vZ;
-// unsigned int nV = 256; // No. of vertices
-// unsigned int nCyc = 5; // No. of spiral cycles
-// double rT1 = 0.1, rT2 = 0.5;// Start/end tube radii
-// double rS = 2; // Spiral radius
-// double h = 10; // Height
- unsigned int nTv = 8; // No. of surface elements for each tube vertex
-