void main()
{
int Radius, Bands, i, j, LastIndex, BandsX2, LastBandStartIndex;
int TopBandStartIndex, BottomBandStartIndex, FaceNum;
struct Point3 BaseVec, BandVec, WorkingVec, TempVec;
char OutputFilename[130];
char Description[130];
printf("Radius: ");
scanf("%d",&Radius);
printf("Bands: ");
scanf("%d",&Bands);
printf("Output file: ");
OutputFilename[0] = 127;
cgets(OutputFilename);
printf("\nBrief description: ");
Description[0] = 127;
cgets(Description);
printf("\n");
BandsX2 = Bands*2;
if ((OutputFile = fopen(&OutputFilename[2], "w")) == NULL) {
printf("Error\n");
exit(1);
}
/* Descriptive comments */
fprintf(OutputFile, "/* %s */\n", &Description[2]);
fprintf(OutputFile, "/* Created with radius = %d, bands = %d */\n",
Radius, Bands);
/* Defines for # of faces and vertices */
fprintf(OutputFile, "#define NUM_FACES %d\n", BandsX2*Bands);
fprintf(OutputFile, "#define NUM_VERTS %d\n\n",
2+1+BandsX2*(Bands-1)+1+ (BandsX2*Bands));
/* # of vertices excluding unit normal endpoints */
fprintf(OutputFile, "#define NUM_REAL_VERTS %d\n\n",
2+1+BandsX2*(Bands-1)+1);
/* Do the polygon vertices */
fprintf(OutputFile, "Point3 Verts[] = {\n");
/* Generate the rotation matrices */
AppendRotationY(YXform, PI / Bands);
AppendRotationZ(ZXform, PI / Bands);
/* Do the point at the top */
BaseVec.X = 0.0;
BaseVec.Y = Radius;
BaseVec.Z = 0.0;
BaseVec.W = 1.0;
PrintVertex(&BaseVec);
BandVec = BaseVec;
/* Do the vertices in each band in turn */
for (i=1; i<Bands; i++) {
/* Rotate around Z to the next band's latitude */
XformVec(ZXform, (double *)&BandVec, (double *)&TempVec);
WorkingVec = BandVec = TempVec;
/* Do the vertices in this band */
for (j=0; j<BandsX2; j++) {
WorkingVec = TempVec;
PrintVertex(&WorkingVec);
/* Now rotate around Y to the next vertex's longitude */
XformVec(YXform, (double *)&WorkingVec, (double *)&TempVec);
}
}
/* Do the point at the bottom */
BaseVec.Y = -Radius;
PrintVertex(&BaseVec);
/* Now generate the unit normal endpoint for each face, as the last
entries in the vertex list */
/* Index in overall vertex list of first unit normal endpoint we'll
create; remember where we can find it */
FirstUnitNormalIndex = NumPoints;
FaceNum = 0;
/* Unit normal endpoints in top band */
for (i=0; i<BandsX2; i++) {
UnitNormal(&BaseVec, 0, ((i+1)%BandsX2)+1, i+1);
PrintVertex(&BaseVec);
FaceNum++;
}
/* Unit normal endpoints in middle bands */
for (j=0; j<(Bands-2); j++) {
TopBandStartIndex = j*BandsX2 + 1;
BottomBandStartIndex = (j+1)*BandsX2 + 1;
/* Indexes in this band */
for (i=0; i<BandsX2; i++) {
UnitNormal(&BaseVec, i+TopBandStartIndex,
((i+1)%BandsX2)+TopBandStartIndex,
i+BottomBandStartIndex);
PrintVertex(&BaseVec);
FaceNum++;
}
}
/* Unit normal endpoints in bottom band */
LastIndex = BandsX2*(Bands-1)+1;
LastBandStartIndex = BandsX2*(Bands-2)+1;
for (i=0; i<BandsX2; i++) {
UnitNormal(&BaseVec, LastBandStartIndex+i,
LastBandStartIndex+((i+1)%BandsX2), LastIndex);
PrintVertex(&BaseVec);
FaceNum++;
}
/* Done generating points, including both polygon vertices and unit
normals */
fprintf(OutputFile, "};\n\n");
/* Do the vertex indexes for each face in each band */
FaceNum = 0;
/* Vertex indexes in top band, with unit normal endpoint first */
for (i=0; i<BandsX2; i++) {
Print4Indexes(FaceNum++, FirstUnitNormalIndex++, 0,
((i+1)%BandsX2)+1, i+1);
}
/* Vertex indexes in middle bands, with unit normal endpoints first */
for (j=0; j<(Bands-2); j++) {
TopBandStartIndex = j*BandsX2 + 1;
BottomBandStartIndex = (j+1)*BandsX2 + 1;
/* Indexes in this band */
for (i=0; i<BandsX2; i++) {
Print5Indexes(FaceNum++, FirstUnitNormalIndex++,
i+TopBandStartIndex,
((i+1)%BandsX2)+TopBandStartIndex,
((i+1)%BandsX2)+BottomBandStartIndex,
i+BottomBandStartIndex);
}
}
/* Vertex indexes in bottom band, with unit normal endpoint first */
LastIndex = BandsX2*(Bands-1)+1;
LastBandStartIndex = BandsX2*(Bands-2)+1;
for (i=0; i<BandsX2; i++) {
Print4Indexes(FaceNum++, FirstUnitNormalIndex++,
LastBandStartIndex+i,
LastBandStartIndex+((i+1)%BandsX2), LastIndex);
}
/* Do the list of pointers to index arrays for each face */
fprintf(OutputFile, "\nstatic int *VertNumList[] = {\n");
for (i=0; i<(BandsX2*Bands); i++) {
fprintf(OutputFile, "Face%d,\n", i);
}
fprintf(OutputFile, "};\n");
/* Do the # of vertices in each face (3 for the top and bottom
bands, 4 for the rest) */
fprintf(OutputFile, "\nstatic int VertsInFace[] = {\n");
for (i=0; i<BandsX2; i++) fprintf(OutputFile, "3,\n");
for (i=0; i<(BandsX2*(Bands-2)); i++) fprintf(OutputFile, "4,\n");
for (i=0; i<BandsX2; i++) fprintf(OutputFile, "3,\n");
fprintf(OutputFile, "};\n");
exit(0);
}
float GravityAcceleration(float x) const { return (ga * UnitNormal(x)); }
