inline Mesh* Mesh::Sphere(std::string name, float32 radius, uint32 segs, uint32 rgs) {
Mesh* mesh = new Mesh(name);
uint32 segments = Mathf.Max(segs, 3) + 1,
rings = Mathf.Max(rgs, 3) + 2;
float32 PI = Mathf.PI,
TWO_PI = PI * 2.0f,
HALF_PI = PI * 0.5f,
R = 1.0f / (rings - 1),
S = 1.0f / (segments - 1),
x, y, z;
uint32 r, s,
a, b, c, d;
Array<Vec3f*>& vertices = mesh->vertices;
Array<Vec3f*>& normals = mesh->normals;
Array<Vec2f*>& uv = mesh->uv;
Array<Colorf*>& colors = mesh->colors;
Array<uint32>& indices = mesh->indices;
for (r = 0; r < rings; r++) {
for (s = 0; s < segments; s++) {
x = Mathf.Cos(TWO_PI * s * S) * Mathf.Sin(PI * r * R);
y = Mathf.Sin(TWO_PI * s * S) * Mathf.Sin(PI * r * R);
z = Mathf.Sin(-HALF_PI + PI * r * R);
vertices.Push(new Vec3f(x * radius, y * radius, z * radius));
normals.Push(new Vec3f(x, y, z));
uv.Push(new Vec2f(s * S, r * R));
colors.Push(new Colorf(s * S, r * R, 0.0f));
}
}
for (r = 0; r < rings - 1; r++) {
for (s = 0; s < segments - 1; s++) {
a = r * segments + s;
b = r * segments + (s + 1);
c = (r + 1) * segments + (s + 1);
d = (r + 1) * segments + s;
indices.Push(a);
indices.Push(b);
indices.Push(c);
indices.Push(a);
indices.Push(c);
indices.Push(d);
}
}
mesh->CalculateTangents();
mesh->CalculateAABB();
return mesh;
}
inline Mesh* Mesh::Plane(std::string name, float32 width, float32 height, int32 widthSegments, int32 heightSegments) {
Mesh* mesh = new Mesh(name);
Mesh::m_BuildPlane(mesh, 0, 1, 1, 1, width, widthSegments, height, heightSegments, 0, 0);
mesh->CalculateTangents();
mesh->CalculateAABB();
return mesh;
}
inline Mesh* Mesh::Cube(std::string name, float32 width, float32 height, float32 depth, int32 widthSegments, int32 heightSegments, int32 depthSegments) {
float32 hw = width * 0.5,
hh = height * 0.5,
hd = depth * 0.5;
Mesh* mesh = new Mesh(name);
Mesh::m_BuildPlane(mesh, 2, 1, -1, 1, depth, depthSegments, height, heightSegments, hw, widthSegments);
Mesh::m_BuildPlane(mesh, 2, 1, 1, 1, depth, depthSegments, height, heightSegments, -hw, widthSegments);
Mesh::m_BuildPlane(mesh, 0, 2, 1, -1, width, widthSegments, depth, depthSegments, hh, heightSegments);
Mesh::m_BuildPlane(mesh, 0, 2, 1, 1, width, widthSegments, depth, depthSegments, -hh, heightSegments);
Mesh::m_BuildPlane(mesh, 0, 1, 1, 1, width, widthSegments, height, heightSegments, hd, depthSegments);
Mesh::m_BuildPlane(mesh, 0, 1, -1, 1, width, widthSegments, height, heightSegments, -hd, depthSegments);
mesh->CalculateTangents();
mesh->CalculateAABB();
return mesh;
}
