Kuwahara Shader
This is a converted shadertoy shader from https://www.shadertoy.com/view/MsXSz4
The Kuwahara filter can be used as an Sprite or post-processing effect. Just add it to an Sprite2D or TextureRect node and add an input texture. The offset can also be used to tint the canvas.
Shader code
shader_type canvas_item;
uniform int radius = 5;
uniform vec3 offset=vec3(0.0);
void fragment()
{
vec2 src_size = vec2 ( SCREEN_PIXEL_SIZE.x, SCREEN_PIXEL_SIZE.y);
vec2 uv = UV.xy;
float n = float((radius + 1) * (radius + 1));
vec3 m0 = offset; vec3 m1 = offset; vec3 m2 = offset; vec3 m3 = offset;
vec3 s0 = offset; vec3 s1 = offset; vec3 s2 = offset; vec3 s3 = offset;
vec3 c;
for (int j = -radius; j <= 0; ++j) {
for (int i = -radius; i <= 0; ++i) {
c = texture(TEXTURE, uv + vec2(float(i),float(j)) * src_size).rgb;
m0 += c;
s0 += c * c;
}
}
for (int j = -radius; j <= 0; ++j) {
for (int i = 0; i <= radius; ++i) {
c = texture(TEXTURE, uv + vec2(float(i),float(j)) * src_size).rgb;
m1 += c;
s1 += c * c;
}
}
for (int j = 0; j <= radius; ++j) {
for (int i = 0; i <= radius; ++i) {
c = texture(TEXTURE, uv + vec2(float(i),float(j)) * src_size).rgb;
m2 += c;
s2 += c * c;
}
}
for (int j = 0; j <= radius; ++j) {
for (int i = -radius; i <= 0; ++i) {
c = texture(TEXTURE, uv + vec2(float(i),float(j)) * src_size).rgb;
m3 += c;
s3 += c * c;
}
}
float min_sigma2 = 1e+2;
m0 /= n;
s0 = abs(s0 / n - m0 * m0);
float sigma2 = s0.r + s0.g + s0.b;
if (sigma2 < min_sigma2) {
min_sigma2 = sigma2;
COLOR = vec4(m0, 1.0);
}
m1 /= n;
s1 = abs(s1 / n - m1 * m1);
sigma2 = s1.r + s1.g + s1.b;
if (sigma2 < min_sigma2) {
min_sigma2 = sigma2;
COLOR = vec4(m1, 1.0);
}
m2 /= n;
s2 = abs(s2 / n - m2 * m2);
sigma2 = s2.r + s2.g + s2.b;
if (sigma2 < min_sigma2) {
min_sigma2 = sigma2;
COLOR = vec4(m2, 1.0);
}
m3 /= n;
s3 = abs(s3 / n - m3 * m3);
sigma2 = s3.r + s3.g + s3.b;
if (sigma2 < min_sigma2) {
min_sigma2 = sigma2;
COLOR = vec4(m3, 1.0);
}
}
this work on 3D projects ? i can’t manage to work. can you give an example ?
it does. you need to to render your 3D game to an texturerect and apply the shader.