diff options
Diffstat (limited to 'polyset.cc')
| -rw-r--r-- | polyset.cc | 43 |
1 files changed, 18 insertions, 25 deletions
@@ -41,18 +41,6 @@ void PolySet::insert_vertex(double x, double y, double z) polygons.last().insert(0, Point(x, y, z)); } -static void set_opengl_normal(double x1, double y1, double z1, double x2, double y2, double z2, double x3, double y3, double z3) -{ - double ax = x1 - x2, ay = y1 - y2, az = z1 - z2; - double bx = x3 - x2, by = y3 - y2, bz = z3 - z2; - double nx = ay*bz - az*by; - double ny = az*bx - ax*bz; - double nz = ax*by - ay*bx; - double n_scale = 1.0 / sqrt(nx*nx + ny*ny + nz*nz); - nx /= n_scale; ny /= n_scale; nz /= n_scale; - glNormal3d(-nx, -ny, -nz); -} - void PolySet::render_surface(colormode_e colormode, GLint *shaderinfo) const { if (colormode == COLOR_MATERIAL) { @@ -71,21 +59,26 @@ void PolySet::render_surface(colormode_e colormode, GLint *shaderinfo) const } for (int i = 0; i < polygons.size(); i++) { const Polygon *poly = &polygons[i]; - glBegin(GL_POLYGON); - set_opengl_normal(poly->at(0).x, poly->at(0).y, poly->at(0).z, - poly->at(1).x, poly->at(1).y, poly->at(1).z, - poly->at(2).x, poly->at(2).y, poly->at(2).z); - for (int j = 0; j < poly->size(); j++) { - const Point *p = &poly->at(j); + + glBegin(GL_TRIANGLES); + for (int j = 2; j < poly->size(); j++) { + const Point *p0 = &poly->at(0); + const Point *p1 = &poly->at(j-1); + const Point *p2 = &poly->at(j); if (shaderinfo) { - if (j%3 == 0) - glVertexAttrib3d(shaderinfo[3], 1.0, 1.0, 0.0); - if (j%3 == 1) - glVertexAttrib3d(shaderinfo[3], 1.0, 0.0, 1.0); - if (j%3 == 2) - glVertexAttrib3d(shaderinfo[3], 0.0, 1.0, 1.0); + double e0 = j == 2 ? 1.0 : 0.0; + double e2 = j == poly->size()-1 ? 1.0 : 0.0; + glVertexAttrib3d(shaderinfo[3], e0, 0.0, e2); + glVertex3d(p0->x, p0->y, p0->z); + glVertexAttrib3d(shaderinfo[3], e0, 1.0, 0.0); + glVertex3d(p1->x, p1->y, p1->z); + glVertexAttrib3d(shaderinfo[3], 0.0, 1.0, e2); + glVertex3d(p2->x, p2->y, p2->z); + } else { + glVertex3d(p0->x, p0->y, p0->z); + glVertex3d(p1->x, p1->y, p1->z); + glVertex3d(p2->x, p2->y, p2->z); } - glVertex3d(p->x, p->y, p->z); } glEnd(); } |