Procedural Bamboo Shader

arlez80 July 20, 2021

A procedural bamboo shader.

Shader code

/*
	竹シェーダー by あるる（きのもと 結衣） @arlez80
	Bamboo Shader by Yui Kinomoto

	MIT License
*/

shader_type spatial;

uniform vec4 stalk_color : hint_color = vec4( 0.45, 0.81, 0.57, 1.0 );
uniform vec4 node_color : hint_color = vec4( 0.97, 0.92, 0.85, 1.0 );
uniform float node_scale = 18.0;
uniform float shift = 0.001;
uniform float noise_scale = 450.0;

float node( float y )
{
	float f = mod( y * node_scale, 1.0 );
	return float( f < 0.02 ) * sin( f * 50.0 );
}

void fragment( )
{
	float x = sin( cos( UV.x * noise_scale ) * 6.0 ) * max( sin( UV.y * node_scale ) * 0.05, 0.01 );
	float y = clamp( -node( UV.y - shift ) + node( UV.y + shift ), -0.5, 0.5 );
	
	NORMALMAP = normalize( vec3( 0.5 + x, 0.5 + y, 0.5 ) );
	ALBEDO = mix( stalk_color.rgb, node_color.rgb, node( UV.y ) );
}