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#include <Vlib.h>
extern VPolygon *ScalePolygon(VPolygon * in, VPoint * origin,
VPoint * scale, double);
VObject *
VExtrudeObject(VObject * obj, VPoint * vec)
{
#ifdef notdef
VPoint tmp[4];
int k, other;
#endif
VPolygon *poly_tmp[65536], *poly;
int i, j;
VObject *newObj;
VPoint scale =
{1, 1, 1};
#ifdef DEBUG
fprintf(stderr, "creating an extrusion based on \"%s\"\n", obj->name);
fprintf(stderr, "starting with %d polygons\n", obj->numPolys);
#endif
newObj = (VObject *) Vmalloc(sizeof(VObject));
newObj->name = obj->name;
newObj->extent = obj->extent;
newObj->center = obj->center;
for (i = 0; i < obj->numPolys; ++i) {
if ((poly_tmp[obj->numPolys - i - 1] = VCopyPolygon(obj->polygon[i]))
== (VPolygon *) NULL) {
fprintf(stderr, "VExtrudeObject: can't copy polygons\n");
exit(1);
}
}
/*
* If clipping is enabled, then we should be reversing the vertices
* of this polygon
*/
for (i = 0, j = obj->numPolys; i < obj->numPolys; ++i, ++j) {
if ((poly_tmp[j] = ScalePolygon(obj->polygon[i], vec, &scale, 0.0))
== (VPolygon *) NULL) {
fprintf(stderr, "VExtrudeObject: can't copy polygons\n");
exit(1);
}
}
/*
* Now create extrusion polygons by marching through the original polygon
* vertices and creating new polygons that connect the edges of the "upper"
* and "lower" polygons as we go.
*/
#ifdef notdef
for (i = 0; i < obj->numPolys; ++i) {
poly = obj->polygon[i];
for (k = 0; k < poly->numVtces; ++k) {
other = (k == 0) ? poly->numVtces - 1 : k - 1;
tmp[0] = poly->vertex[other];
tmp[1] = poly->vertex[k];
tmp[2] = poly->vertex[k];
tmp[2].x += vec->x;
tmp[2].y += vec->y;
tmp[2].z += vec->z;
tmp[3] = poly->vertex[other];
tmp[3].x += vec->x;
tmp[3].y += vec->y;
tmp[3].z += vec->z;
poly_tmp[j++] = VCreatePolygonFromTemplate(4, tmp, poly);
}
}
#endif
/*
* Complete filling the object structure
*/
#ifdef DEBUG
fprintf(stderr, "%d polygons in the extruded object\n", j);
#endif
newObj->polygon = (VPolygon **) Vmalloc(sizeof(VPolygon *) * j);
newObj->numPolys = j;
for (i = 0; i < j; ++i) {
newObj->polygon[i] = poly_tmp[i];
}
return newObj;
}
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