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Added draw_billboard to models.rs #901

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Added draw_billboard to models.rs #901

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21 changes: 21 additions & 0 deletions src/models.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,27 @@ pub fn draw_grid_ex(
}
}

pub fn draw_billboard(center: Vec3, size: Vec2, texture: Option<&Texture2D>, color: Color, look_at: &Vec3) {
let forward = (center - *look_at).normalize();
let up = vec3(0.0, 1.0, 0.0);
let right = up.cross(forward).normalize();
let up = forward.cross(right).normalize();

let half_w = size.x * 0.5;
let half_h = size.y * 0.5;

let v1 = Vertex::new2(center + (-right * half_w + up * half_h), vec2(0., 0.), color);
let v2 = Vertex::new2(center + (-right * half_w - up * half_h), vec2(0., 1.), color);
let v3 = Vertex::new2(center + (right * half_w - up * half_h), vec2(1., 1.), color);
let v4 = Vertex::new2(center + (right * half_w + up * half_h), vec2(1., 0.), color);

{
let context = get_context();
context.gl.texture(texture);
}
draw_quad([v1, v2, v3, v4]);
}

pub fn draw_plane(center: Vec3, size: Vec2, texture: Option<&Texture2D>, color: Color) {
let v1 = Vertex::new2(center + vec3(-size.x, 0., -size.y), vec2(0., 0.), color);
let v2 = Vertex::new2(center + vec3(-size.x, 0., size.y), vec2(0., 1.), color);
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