Shaders

two_lane_blacktop - A procedural shader for a street surface

This Renderman shader applies a street texture to a surface, consisting of an asphalt road, two stripes on the edges of the lanes, and a center stripe.

The user can control several parameters, including the color, length and width of the stripes, the turbulence of the asphalt, etc.

The anti-aliasing of the stripe could use some improvement, especially where it recedes into the background.

Parameter	Data Type	Usage	Example
asphalt_turbulence	float >= 1.0	The "turbulence" of the asphalt, smaller values give bigger chunks	asphalt_turbulence = 16
stripe_rotation	float 0 to 360	The degrees of rotation of the stripes on the surface, typically 0 or 90.	stripe_rotation = 90
center_stripe_color	RGB color	The color of the center stripe	center_stripe_color = color(1, 1, 0)
edge_stripe_color	RGB color	The color of the two edge stripes	edge_stripe_color = color(1, 1, 1)
stripe_width	RGB color	The width of the stripes	stripe_width = 41
center_stripe_count	integer > 0	The number of center stripes on the length of the road surface	center_stripe_count = 80
center_stripe_length	float 0.0 to 1.0	The painted proportion of the center stripe area.	center_stripe_length = 0.5
fuzz_s	float 0.0 to 1.0	The anti-aliasing value for the width of the stripes	fuzz_s = 0.05
fuzz_t	float 0.0 to 1.0	The anti-aliasing value for the length of the center stripes	fuzz_t = 0.05

View the two_lane_blacktop shader source

Download the two_lane_blacktop package for Presenter 3D