static void draw_texture_tri(Real v1[3], Real v2[3], Real v3[3], int textureNum){
glBindTexture(GL_TEXTURE_2D, textureNum);
if(!draw_top){
glBegin(GL_TRIANGLES);
geom_calc_normal(v1, v2, v3, norm);
glNormal3rv(norm);
glTexCoord2f(0,0);
glVertex3rv(v1);
glTexCoord2f(1, 0);
glVertex3rv(v2);
glTexCoord2f(0, 1);
glVertex3rv(v3);
glEnd();
draw_top = true;
}else{
glBegin(GL_TRIANGLES);
geom_calc_normal(v1, v2, v3, norm);
glNormal3rv(norm);
glTexCoord2f(1,0);
glVertex3rv(v1);
glTexCoord2f(1, 1);
glVertex3rv(v2);
glTexCoord2f(0, 1);
glVertex3rv(v3);
glEnd();
draw_top = false;
}
glBindTexture(GL_TEXTURE_2D, 0);
totalVerts += 6;
}
/* Returns [a, b, c, d] where:
ax + by + cz + d = 0
plane normal = [a, b, c]
d = -n dot P, where P is a point in the plane
*/
int geom_get_tri_plane(const Real* tri, Real* plane_ret) {
// calc normal
Real vn[3];
geom_calc_normal(tri+0*3, tri+1*3, tri+2*3, vn);
Real d = -geom_vector3_dot(vn, tri+0*3);
geom_vector3_copy(vn, plane_ret);
plane_ret[3] = d;
return GEOM_NO_ERROR;
}
static void draw_new_tri(Real v1[3], Real v2[3], Real v3[3]){
glBegin(GL_TRIANGLES);
geom_calc_normal(v1, v2, v3, norm);
glNormal3rv(norm);
glVertex3rv(v1);
glVertex3rv(v2);
glVertex3rv(v3);
glEnd();
}
