3 #include "primitivebuilder.h"
10 GridBuilder::GridBuilder(float w, float h, unsigned u, unsigned v):
11 origin(-w/2, -h/2, 0),
22 GridBuilder::GridBuilder(const Vector3 &o, const Vector3 &s, unsigned u, unsigned v):
27 if(abs(s.z)<abs(s.x) && abs(s.z)<abs(s.y))
29 side1 = Vector3(s.x, 0, 0);
30 side2 = Vector3(0, s.y, 0);
32 else if(abs(s.y)<abs(s.x))
34 side1 = Vector3(0, 0, s.z);
35 side2 = Vector3(s.x, 0, 0);
39 side1 = Vector3(0, s.y, 0);
40 side2 = Vector3(0, 0, s.z);
45 GridBuilder::GridBuilder(const Vector3 &o, const Vector3 &s1, const Vector3 &s2, unsigned u, unsigned v):
55 void GridBuilder::init(bool compute_normals)
64 norm.x = side1.y*side2.z-side1.z*side2.y;
65 norm.y = side1.z*side2.x-side1.x*side2.z;
66 norm.z = side1.x*side2.y-side1.y*side2.x;
67 float l = sqrt(norm.x*norm.x+norm.y*norm.y+norm.z*norm.z);
72 binorm.x = norm.y*side1.z-norm.z*side1.y;
73 binorm.y = norm.z*side1.x-norm.x*side1.z;
74 binorm.z = norm.x*side1.y-norm.y*side1.x;
75 l = sqrt(binorm.x*binorm.x+binorm.y*binorm.y+binorm.z*binorm.z);
82 void GridBuilder::build(PrimitiveBuilder &builder) const
84 float l1_sq = side1.x*side1.x+side1.y*side1.y+side1.z*side1.z;
85 float l2 = side2.x*binorm.x+side2.y*binorm.y+side2.z*binorm.z;
86 float u_scale = 1/l1_sq;
88 adjust_texture_scale(u_scale, v_scale, sqrt(l1_sq), l2);
90 builder.normal(norm.x, norm.y, norm.z);
92 builder.attrib(tangent_attr, side1.x, side1.y, side1.z);
94 builder.attrib(tangent_attr, binorm.x, binorm.y, binorm.z);
96 for(unsigned j=0; j<=v_div; ++j)
98 float v = j*1.0/v_div;
99 Vector3 row(origin.x+side2.x*v, origin.y+side2.y*v, origin.z+side2.z*v);
100 v = (row.x*binorm.x+row.y*binorm.y+row.z*binorm.z)*v_scale;
101 for(unsigned i=0; i<=u_div; ++i)
103 float u = i*1.0/u_div;
104 Vector3 p(row.x+side1.x*u, row.y+side1.y*u, row.z+side1.z*u);
105 u = (p.x*side1.x+p.y*side1.y+p.z*side1.z)*u_scale;
106 builder.texcoord(u, v);
111 for(unsigned j=0; j<v_div; ++j)
113 builder.begin(TRIANGLE_STRIP);
114 for(unsigned i=0; i<=u_div; ++i)
116 builder.element((j+1)*(u_div+1)+i);
117 builder.element(j*(u_div+1)+i);