Billboards

A billboard or impostor is a flat 2D object (usually a textured quad) that always faces the camera, no matter where the camera moves. It's a common trick used to represent complex visuals with simple geometry.

To render a billboard, add the Billboard functional declaration to your Frame context. Additionally, apply the billboard material to fine-tune:

Billboard (
    base(colorTexture = texture("textures/sprite.png")),
    billboard(
        position = Vec3(3f, 5f, 7f),
        scale = Vec2(2f, 2f),
        rotation = 0.3f
    ),
    transparent = true
)

billboard materials supports the following parameters:

Uniform name	Type	Default value	Description
position	Vec3	(0, 0, 0)	World position of billboard's center
scale	Vec2	(1, 1)	Billboard's size (horizontal/vertical)
rotation	Float	0.0f	Rotation (in radians)