2D shadow out of bounds

A natural-ish shadow that will draw out of bounds, good for top down 2D.

Thank you to deakcor and Mateus-Carmo31 as this is basically just a mashup of their code

 

Notes:

-Make sure you leave a 1 px buffer around your sprite of empty space or it’ll stretch

-Messes with the offset settings of a sprite, be aware of that for y sorting

-If the shadow starts clipping increase the x or y buffers

-Does not currently support spritesheets, might add later

 

For Godot 4+

Shader code
/**
* Shadow 2D.
* License: CC0
* https://creativecommons.org/publicdomain/zero/1.0/
*/
shader_type canvas_item;
render_mode blend_mix;

uniform vec2 deform = vec2(2.0, 2.0);
uniform vec2 offset = vec2(0.0, 0.0);
uniform vec4 modulate : source_color;
uniform float x_buffer = 2.0;//Increase these if you need your shadow to stretch further
uniform float y_buffer = 2.0;

//uniform vec2 texture_size; //uncomment for GLES2

void vertex() {	
	//This increases the size of the uv so the sprite can be drawn 'out of bounds'
	VERTEX.x *= x_buffer;
	VERTEX.y *= y_buffer;
}

void fragment() {
	
	//This part resizes your sprite back to normal after the uv adjustment
	vec2 uvTest = UV * 2.0 - 1.0;	
	uvTest.x *= x_buffer;
	uvTest.x /= 1.0;
	uvTest.y *= y_buffer;
	uvTest.y /= 1.0;
	uvTest = (uvTest + 1.0) / 2.0;
	COLOR = texture(TEXTURE, uvTest);
	
	vec2 ps = TEXTURE_PIXEL_SIZE;
	vec2 uv = uvTest;
	float sizex = float(textureSize(TEXTURE,int(ps.x)).x); //comment for GLES2
	float sizey = float(textureSize(TEXTURE,int(ps.y)).y); //comment for GLES2
	//float sizex = texture_size.x; //uncomment for GLES2
	//float sizey = texture_size.y; //uncomment for GLES2
	uv.y+=offset.y*ps.y;
	uv.x+=offset.x*ps.x;
	float decalx=((uv.y-ps.x*sizex)*deform.x);
	float decaly=((uv.y-ps.y*sizey)*deform.y);
	uv.x += decalx;
	uv.y += decaly;
	vec4 shadow = vec4(modulate.rgb, texture(TEXTURE, uv).a * modulate.a);
	vec4 col = texture(TEXTURE, uvTest);
	COLOR = mix(shadow, col, col.a);
}
Tags
2d, shadow, top down
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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2D Topdown Shadow that goes out of bounds

Cut Out shader

Sprite Cut-Out/Cut-In Mask

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