libgarbage: change default to be only using one sdf function, with materials, since it seems to get optimised out anyway
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3 changed files with 59 additions and 40 deletions
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@ -598,8 +598,8 @@ Transform:
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@ -1678,7 +1678,7 @@ Transform:
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@ -1761,7 +1761,7 @@ Transform:
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@ -3,23 +3,39 @@
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#include "UnityCG.cginc"
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/*
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# defines with no defaults
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## defines with no defaults
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# default is object space
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USE_WORLD_SPACE
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# renders missed rays as transparent
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DISCARD_ON_MISS
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USE_MATERIALS_IN_RAYMARCH // TODO: implement, this is easier to work with but more expensive
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# use if the shape of the scene is significnatly different from the shape of the material space
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# will use SCENE_FN only for the final step, and DISTANCE_FN for raymarching
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# DISTANCE_FN must return a float
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SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
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# don't write depth (will have the depth defined by the original mesh)
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DISABLE_DEPTH
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START_RAYS_IN_BOX // TODO: implement
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START_RAYS_IN_SPHERE // TODO: implement
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*/
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// scene sdf that includes material data
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#ifndef SCENE_FN
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#define SCENE_FN default_material_sdf
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#endif
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#ifdef SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
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// scene sdf with only distance
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#ifndef DISTANCE_FN
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#define DISTANCE_FN default_distance_sdf
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#endif
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// scene sdf that includes material data
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#ifndef MATERIAL_FN
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#define MATERIAL_FN default_material_sdf
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#else
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#define DISTANCE_FN material_fn_as_dist
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#endif
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// calculates a color from a Ray
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@ -105,7 +121,7 @@ struct Ray {
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float DISTANCE_FN(float3 p);
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SurfacePoint MATERIAL_FN(float3 p);
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SurfacePoint SCENE_FN(float3 p);
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float3 LIGHT_FN(Ray ray);
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Ray cast_ray(float3 p, float3 d, float startDist = 0);
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@ -219,7 +235,7 @@ Ray cast_ray(float3 start, float3 dir, float start_len) {
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ray.mat = mat();
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} else {
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ray.normal = get_normal(ray.hit_pos, ray.dist);
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ray.mat = MATERIAL_FN(ray.hit_pos).mat;
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ray.mat = SCENE_FN(ray.hit_pos).mat;
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}
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return ray;
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}
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@ -228,6 +244,10 @@ float default_distance_sdf(float3 p) {
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return sdSphere(p, 0.5);
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}
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float material_fn_as_dist(float3 p) {
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return SCENE_FN(p).dist;
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}
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SurfacePoint default_material_sdf(float3 p) {
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return mSphere(p, 0.5);
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}
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@ -5,7 +5,7 @@ Shader "CrispyPin/LibGarbageExample"
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[Header(Raymarcher Properties)]
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_MaxSteps ("Max steps", Int) = 128
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_MaxDist ("Max distance", Float) = 128
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_SurfDist ("Surface distance threshold", Range(0.00001, 0.05)) = 0.001
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_SurfDist ("Surface distance threshold", Range(0.0001, 0.05)) = 0.001
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}
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SubShader
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@ -21,38 +21,28 @@ Shader "CrispyPin/LibGarbageExample"
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#pragma fragment frag
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int _MaxSteps;
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#define MAX_STEPS _MaxSteps
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float _MaxDist;
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#define MAX_DIST _MaxDist
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float _SurfDist;
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#define MAX_STEPS _MaxSteps
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#define MAX_DIST _MaxDist
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#define SURF_DIST _SurfDist
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#define REFLECTIONS 3
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#define DISTANCE_FN main_dist
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#define MATERIAL_FN main_mat
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#define LIGHT_FN lighting
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#define SCENE_FN main
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// #define SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
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// #define SCENE_FN separate_mat
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// #define DISTANCE_FN separate_dist
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// #define DISABLE_DEPTH
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// #define DISCARD_ON_MISS
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#define USE_WORLD_SPACE
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// #define USE_WORLD_SPACE
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#define SCENE_SCALE 0.05
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#include "libgarbage.cginc"
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float main_dist(float3 p) {
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float d = sdPlaneY(p, 0);
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d = qIntersect(d, sdSphere(p, 9), 0.5);
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d = qUnion(d, sdSphere(p - float3(0, 2, 0), 2));
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d = qUnion(d, sdTorus(rotX(p, _Time * 40 + UNITY_PI / 2), 5, 0.5), 0.5);
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d = qUnion(d, sdTorus(rotZ(p, _Time * 40 + UNITY_PI / 2), 5, 0.5), 0.5);
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d = qUnion(d, sdTorus(rotX(p, _Time * 40), 5, 0.5), 0.5);
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d = qUnion(d, sdTorus(rotZ(p, _Time * 40), 5, 0.5), 0.5);
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// small spheres
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float3 p2 = abs(rotY(p, -20 * _Time)) - float3(1.5, sin(_Time.y * 5) + 1, 1.5);
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d = qUnion(d, sdSphere(p2, 0.7), 0.2);
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return d;
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}
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SurfacePoint main_mat(float3 p) {
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SurfacePoint main(float3 p) {
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Material grass = mat(float3(0.001, 0.1, 0.001), 0.3);
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Material dirt = mat(float3(0.1, 0.04, 0.01), 0);
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Material metal = mat(0.1, 1);
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@ -71,10 +61,19 @@ Shader "CrispyPin/LibGarbageExample"
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return d;
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}
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SurfacePoint separate_mat(float3 p) {
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Material blue = mat(float3(0.05, 0.1, 0.2), 0);
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SurfacePoint d = mSphere(p, 1, blue);
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return d;
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}
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float separate_dist(float3 p) {
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return main(p).dist;
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}
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float3 lighting(Ray ray) {
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if (ray.missed)
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return lRenderSky(ray.dir, normalize(float3(4,2,1)));
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// return float3(0.15, 0.25, 0.3);
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float3 sun_dir = normalize(float3(4, 2, 1));
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float3 col = 0;
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