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Add Cone and Cylinder shapes to FogVolume

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This complements the existing Ellipsoid and Box local fog shapes.

This can be used to represent a light cone coming from a SpotLight.
This commit is contained in:
Hugo Locurcio
2022-05-21 12:17:49 +02:00
parent 1c99b7415f
commit e85459dcd1
8 changed files with 49 additions and 12 deletions
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23
servers/rendering/renderer_rd/shaders/volumetric_fog.glsl
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@@ -186,12 +186,31 @@ void main() {
float sdf = -1.0;
if (params.shape == 0) {
//Ellipsoid
// Ellipsoid
// https://www.shadertoy.com/view/tdS3DG
float k0 = length(local_pos.xyz / params.extents);
float k1 = length(local_pos.xyz / (params.extents * params.extents));
sdf = k0 * (k0 - 1.0) / k1;
} else if (params.shape == 1) {
// Cone
// https://iquilezles.org/www/articles/distfunctions/distfunctions.htm
// Compute the cone angle automatically to fit within the volume's extents.
float inv_height = 1.0 / max(0.001, params.extents.y);
float radius = 1.0 / max(0.001, (min(params.extents.x, params.extents.z) * 0.5));
float hypotenuse = sqrt(radius * radius + inv_height * inv_height);
float rsin = radius / hypotenuse;
float rcos = inv_height / hypotenuse;
vec2 c = vec2(rsin, rcos);
float q = length(local_pos.xz);
sdf = max(dot(c, vec2(q, local_pos.y - params.extents.y)), -params.extents.y - local_pos.y);
} else if (params.shape == 2) {
// Cylinder
// https://iquilezles.org/www/articles/distfunctions/distfunctions.htm
vec2 d = abs(vec2(length(local_pos.xz), local_pos.y)) - vec2(min(params.extents.x, params.extents.z), params.extents.y);
sdf = min(max(d.x, d.y), 0.0) + length(max(d, 0.0));
} else if (params.shape == 3) {
// Box
// https://iquilezles.org/www/articles/distfunctions/distfunctions.htm
vec3 q = abs(local_pos.xyz) - params.extents;
@@ -199,7 +218,7 @@ void main() {
}
float cull_mask = 1.0; //used to cull cells that do not contribute
if (params.shape <= 1) {
if (params.shape <= 3) {
#ifndef SDF_USED
cull_mask = 1.0 - smoothstep(-0.1, 0.0, sdf);
#endif