Mesh Blending with Alpha

This shader is used to blend between two meshes or mesh and terrain, it is applied to the mesh. The blending works via the alpha value. The problems of non-convex meshes, are avoided by setting the render_mode to depth_draw_always.

Features:

– works with non-convex meshes

– no triplanar mapping

Shader code

/*
	Mesh Blending with Alpha Shader by Firerabbit
	
	MIT License
*/
shader_type spatial;
render_mode depth_draw_always;

uniform float proximity_fade_distance : hint_range(0.0, 1.0) = 0.3;
uniform float falloff : hint_range(0.001, 5.0) = 1.0;
uniform vec4 color : hint_color = vec4(1.0);
uniform sampler2D albedo : hint_albedo;


float saturate(float val) {
	return clamp(val, 0.0, 1.0);
}


void fragment() {
	float depth = texture(DEPTH_TEXTURE,SCREEN_UV).r;
	
	vec2 remaped_uv = UV * vec2(2.0) - vec2(1.0);
	float remaped_depth = depth * 2.0 - 1.0;
	
	vec4 world_pos = INV_PROJECTION_MATRIX * vec4(remaped_uv, remaped_depth, 1.0);
	world_pos.xyz /= world_pos.w;
	
	ALPHA *= saturate(1.0 - smoothstep(world_pos.z + proximity_fade_distance, world_pos.z, VERTEX.z));
	ALPHA = pow(ALPHA, falloff);
	ALBEDO = color.rgb * texture(albedo, UV).rgb;
}

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