- initial import

git-svn-id: http://moon:8086/svn/mips@1 a8ebac50-d88d-4704-bea3-6648445a41b3
2014-07-20 15:01:37 +00:00
commit 26291bca3d
1549 changed files with 3997969 additions and 0 deletions
@@ -0,0 +1,47 @@
+#include "ri.h"
+#include "patches.h"
+
+#define NU 13
+#define MAXNPTS 100
+#define F .5522847 
+
+/* Listing 6.3  Version of SurfOR() taking profile points */
+/*              and producing a bicubic                   */
+float coeff[NU][2] = { 
+    { 1, 0 }, { 1, F }, { F, 1 }, { 0, 1 }, {-F, 1 }, {-1, F }, 
+    {-1, 0 }, {-1,-F }, {-F,-1 }, { 0,-1 }, { F,-1 }, { 1,-F }, { 1, 0} };
+
+RtPoint    mesh[MAXNPTS][NU];
+
+void SurfOR(Point2D points[], int npoints)
+{
+    int        u, v;
+
+/*    coeff holds a matrix of coefficients for sweeping a point on the XZ
+ *    plane circularly around the Z axis, with the circle approximated by 
+ *    4 Bezier curves
+ */
+    for (v = 0; v < npoints; v++) {    
+        /* 
+         *  Start at the upper left of the mesh.  For each 
+         *  control point on the circle being swept out, 
+         *  rotate every point on the XZ curve into position
+         */
+        for (u = 0; u < NU; u++) {    
+            /*  Here comes each point on the XZ curve */
+            mesh[v][u][0] = points[v].x * coeff[u][0];
+            mesh[v][u][1] = points[v].x * coeff[u][1];
+            mesh[v][u][2] = points[v].y;
+        }
+    }
+//    RiBasis(RiPowerBasis, RI_POWERSTEP, RiPowerBasis, RI_POWERSTEP);
+//    RiBasis(RiHermiteBasis, RI_HERMITESTEP, RiHermiteBasis, RI_HERMITESTEP);
+//    RiBasis(RiCatmullRomBasis, RI_CATMULLROMSTEP, RiCatmullRomBasis, RI_CATMULLROMSTEP);
+//    RiBasis(RiBSplineBasis, RI_BSPLINESTEP, RiBSplineBasis, RI_BSPLINESTEP);
+    RiBasis(RiBezierBasis, RI_BEZIERSTEP, RiBezierBasis, RI_BEZIERSTEP);
+    RiPatchMesh(RI_BICUBIC, 
+           (RtInt) NU, RI_NONPERIODIC,
+           (RtInt) npoints, RI_NONPERIODIC,
+           RI_P, (RtPointer) mesh, 
+           RI_NULL);
+}