# Create a perspective transformation matrix
	#
	# Using the given vertical `field_of_view_y` in radians, the `aspect_ratio`
	# and the `near`/`far` world distances.
	new perspective(field_of_view_y, aspect_ratio, near, far: Float)
	do
		var frustum_height = (field_of_view_y/2.0).tan * near
		var frustum_width = frustum_height * aspect_ratio

		return new Matrix.frustum(-frustum_width, frustum_width,
		                          -frustum_height, frustum_height,
		                          near, far)
	end