Quick Example Fresnel Outline

A quick example of using the fresnel as an outline if you don’t want to use a post-processing shader.

Shader code

shader_type spatial;

// Higher values are smaller width.
uniform float outline_width : hint_range(0.0, 10.0, 0.1) = 5.0;

uniform vec4 base_color : source_color = vec4(1.0);

float fresnel(float amount, vec3 normal, vec3 view)
{
	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0 )), amount);
}

void fragment()
{
	float basic_fresnel = fresnel(outline_width, NORMAL, VIEW);
	basic_fresnel = step(0.5, basic_fresnel); //0.5 magic number seems to give the most intuitive control
	ALBEDO = base_color.rgb - basic_fresnel;
}