libgarbage: support instancing

Assets/raymarched/Raymarching.unity

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Assets/raymarched/lib/GarbageExample.mat

@@ -63,8 +63,8 @@ Material:
     - _GlossMapScale: 1
     - _Glossiness: 0.5
     - _GlossyReflections: 1
-    - _MaxDist: 256
-    - _MaxSteps: 256
+    - _MaxDist: 512
+    - _MaxSteps: 512
     - _Metallic: 0
     - _Mode: 0
     - _OcclusionStrength: 1

Assets/raymarched/lib/libgarbage.cginc

@@ -1,61 +1,290 @@
-struct appdata
-{
+#ifndef LIBGARBAGE_INCLUDED
+#define LIBGARBAGE_INCLUDED
+#include "UnityCG.cginc"
+
+/*
+## defines with no defaults
+
+# default is object space
+	USE_WORLD_SPACE
+
+# renders missed rays as transparent
+	DISCARD_ON_MISS
+
+# use if the shape of the scene is significnatly different from the shape of the material space
+# will use SCENE_FN only for the final step, and DISTANCE_FN for raymarching
+# DISTANCE_FN must return a float
+	SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
+
+# don't write depth (will have the depth defined by the original mesh)
+	DISABLE_DEPTH
+
+# meant for frontface culled meshes, makes depth no further than the mesh edges
+	LIMIT_DEPTH_TO_MESH
+
+START_RAYS_IN_BOX // TODO: implement
+START_RAYS_IN_SPHERE // TODO: implement
+*/
+
+
+// scene sdf that includes material data
+#ifndef SCENE_FN
+#define SCENE_FN default_material_sdf
+#endif
+
+#ifdef SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
+	// scene sdf with only distance
+	#ifndef DISTANCE_FN
+	#define DISTANCE_FN default_distance_sdf
+	#endif
+#else
+	#define DISTANCE_FN material_fn_as_dist
+#endif
+
+// calculates a color from a Ray
+#ifndef LIGHT_FN
+#define LIGHT_FN default_lighting
+#endif
+
+// set to less than one if there are artifacts in distorted sdfs
+#ifndef STEP_MULTIPLIER
+#define STEP_MULTIPLIER 1
+#endif
+
+// max ray steps, from last bounce (reset on each reflection)
+#ifndef MAX_STEPS
+#define MAX_STEPS 128
+#endif
+
+// max ray length, from last bounce (length is reset on each reflection)
+#ifndef MAX_DIST
+#define MAX_DIST 128
+#endif
+
+// the largest surface distance that is counted as a hit
+#ifndef SURF_DIST
+#define SURF_DIST 0.001
+#endif
+
+#ifndef REFLECTIONS
+#define REFLECTIONS 0
+#endif
+
+#ifndef SCENE_SCALE
+#define SCENE_SCALE 1
+#endif
+
+// TODO: implement
+#ifndef AMBIENT_OCCLUSION_STEPS
+#define AMBIENT_OCCLUSION_STEPS 4
+#endif
+
+
+struct AppData {
 	float4 vertex : POSITION;
+	UNITY_VERTEX_INPUT_INSTANCE_ID
 };
 
-struct v2f
-{
+struct V2F {
 	float4 vertex : SV_POSITION;
-    float3 vCamPos : TEXCOORD1;
-    float3 vHitPos : TEXCOORD2;
+	float3 cam_pos : TEXCOORD0;
+	float3 hit_pos : TEXCOORD1;
+	UNITY_VERTEX_OUTPUT_STEREO
 };
 
-struct fragOut
-{
-    fixed4 col : SV_Target;
-    // float depth : SV_Depth;
+struct FragOut {
+	fixed3 col : SV_Target;
+#ifndef DISABLE_DEPTH
+	float depth : SV_Depth;
+#endif
 };
 
-v2f vert (appdata v)
-{
-    v2f o;
+struct Material {
+	float3 col;
+	float gloss;
+};
+#define DEFAULT_MAT {float3(1, 1, 1), 0}
+Material mat(float3 col = float3(1, 1,1 ), float gloss = 0) {
+	Material m;
+	m.col = col;
+	m.gloss = gloss;
+	return m;
+}
+
+struct SurfacePoint {
+	float dist;
+	Material mat;
+};
+
+//used for lighting a point
+struct Ray {
+	float dist;
+	int steps;
+	Material mat;
+	float3 start;
+	float3 dir;
+	float3 hit_pos;
+	float3 normal;
+	bool missed;
+	float min_dist; // smallest distance encountered along the path (only useful for misses; shadow calculations)
+};
+
+
+float DISTANCE_FN(float3 p);
+SurfacePoint SCENE_FN(float3 p);
+float3 LIGHT_FN(Ray ray);
+Ray cast_ray(float3 p, float3 d, float startDist = 0);
+
+#include "libgarbage_shapes.cginc"
+#include "libgarbage_operations.cginc"
+#include "libgarbage_lighting.cginc"
+
+V2F vert (AppData v) {
+	V2F o;
+	UNITY_SETUP_INSTANCE_ID(v);
+	UNITY_INITIALIZE_OUTPUT(V2F, o);
+	UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
 	o.vertex = UnityObjectToClipPos(v.vertex);
 	#ifdef USE_WORLD_SPACE
-    o.vCamPos = _WorldSpaceCameraPos;
-    o.vHitPos = mul(unity_ObjectToWorld, v.vertex);
+	o.cam_pos = _WorldSpaceCameraPos;
+	o.hit_pos = mul(unity_ObjectToWorld, v.vertex);
 	#else
-    o.vCamPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
-    o.vHitPos = v.vertex;
+	o.cam_pos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
+	o.hit_pos = v.vertex;
 	#endif
 	return o;
 }
 
-fragOut frag (v2f i)
-{
-	fragOut o;
-	o.col = 1;
-	o.col.r = 0;
+FragOut frag (V2F i) {
+	float ray_len = 0;
+	float3 ray_dir = normalize(i.hit_pos - i.cam_pos);
+
+	float3 ray_origin = i.cam_pos;
+	ray_origin /= SCENE_SCALE;
+	SurfacePoint point_data;
+	Ray ray;
+
+	float3 col;
+	float color_used = 0;// what amount of the final color has been calculated
+	float prev_gloss = 0;
+	float3 first_hit;
+
+	int ray_num = 0;
+	for (; ray_num < REFLECTIONS + 1;) {
+		ray = cast_ray(ray_origin, ray_dir);
+		if (ray_num == 0) { // before any bounces
+			col = LIGHT_FN(ray);
+			first_hit = ray.hit_pos;
+			if (ray.steps == 0) {
+				// discard;
+				// TODO: sky fn
+			}
+		} else {
+			float col_amount = color_used + ((1 - prev_gloss) * (1 - color_used));
+			col = lerp(LIGHT_FN(ray), col, col_amount);
+			color_used = col_amount;
+		}
+		ray_num++;
+		if (ray.missed || ray.mat.gloss < 0.01) {
+			break;
+		}
+		prev_gloss = ray.mat.gloss;
+		ray_dir = reflect(ray_dir, ray.normal);
+		ray_origin = ray.hit_pos + ray_dir * 0.01;
+	}
+
+	#ifdef DISCARD_ON_MISS
+	if (ray.missed && ray_num == 1) discard;
+	#endif
+
+	FragOut o;
+	o.col = col;
+
+	#ifndef DISABLE_DEPTH
+		float3 depth_point = first_hit * SCENE_SCALE;
+		if (ray.missed && ray_num == 1)
+			depth_point = i.hit_pos;
+
+		#ifdef LIMIT_DEPTH_TO_MESH
+			if (length(ray.start - ray.hit_pos) > length(i.cam_pos - i.hit_pos))
+				depth_point = i.hit_pos;
+		#endif
+
+		#ifdef USE_WORLD_SPACE
+			float4 clip_pos = mul(UNITY_MATRIX_VP, float4(depth_point, 1));
+		#else
+			float4 clip_pos = mul(UNITY_MATRIX_VP, mul(unity_ObjectToWorld, float4(depth_point, 1)));
+		#endif
+		o.depth = clip_pos.z / clip_pos.w;
+		#ifndef UNITY_REVERSED_Z // basically only OpenGL (unity editor on linux)
+			o.depth = o.depth * 0.5 + 0.5; // remap -1 to 1 range to 0.0 to 1.0
+		#endif
+	#endif
 	return o;
 }
 
-// #define SOME_MAGIC(main_fn) float3 main1()\
-// main_fn \
+inline float3 get_normal(float3 pos, float surface_distance, float epsilon = 0.001) {
+	// if epsilon is smaller than 0.001, there are often artifacts
+	const float2 e = float2(epsilon, 0);
+	float3 n = surface_distance - float3(
+			DISTANCE_FN(pos - e.xyy),
+			DISTANCE_FN(pos - e.yxy),
+			DISTANCE_FN(pos - e.yyx));
+	return normalize(n);
+}
 
-#define SOME_MAGIC(PASS, function_definition) float3 main##PASS() function_definition
+Ray cast_ray(float3 start, float3 dir, float start_len) {
+	float ray_len = start_len;
 
-#define DO_MAGIC MAIN_FN(1)
+	Ray ray;
+	ray.dir = dir;
+	ray.start = start;
+	ray.min_dist = 100100100; // budget "infinity"
+	ray.missed = true;
 
-// #define SECOND_PASS 1
-// #define AA MAIN_FN
-// #define BB MAIN_FN
+	for (int i = 0; i < MAX_STEPS; i++) {
+		ray.hit_pos = start + ray_len * dir;
+		ray.dist = DISTANCE_FN(ray.hit_pos);
+		if (ray.dist < SURF_DIST) {
+			ray.missed = false;
+			break;
+		}
+		ray.min_dist = min(ray.min_dist, ray.dist);
+		ray_len += ray.dist * STEP_MULTIPLIER;
+		if (ray_len > MAX_DIST) break;
+	}
+
+	ray.steps = i;
+	if (ray.missed) {
+		ray.normal = float3(0, 0, 0);
+		ray.mat = mat();
+	} else {
+		ray.normal = get_normal(ray.hit_pos, ray.dist);
+		ray.mat = SCENE_FN(ray.hit_pos).mat;
+	}
+	return ray;
+}
+
+float default_distance_sdf(float3 p) {
+	return sdSphere(p, 0.5);
+}
+
+float material_fn_as_dist(float3 p) {
+	return SCENE_FN(p).dist;
+}
+
+SurfacePoint default_material_sdf(float3 p) {
+	return mSphere(p, 0.5);
+}
+
+float3 default_lighting(Ray ray) {
+	float3 sun_dir = normalize(float3(1, 0.5, 0));
+	if (ray.missed)
+		return 0.1;
+	float3 col = 0;
+	col = ray.mat.col * dot(ray.normal, sun_dir);
+	return col;
+}
 
 
-// float3 main2() \
-// main_fn
-
-// \
-// float3 main2() \
-// main_fn\
-
-
-// #define SECOND_PASS \
+#endif // LIBGARBAGE_INCLUDED

Assets/raymarched/lib/libgarbage_end.cginc

@@ -1 +0,0 @@
-#define DO_MAGIC(p) MAIN_FN(p)

Assets/raymarched/lib/libgarbage_example.shader

@@ -2,17 +2,16 @@ Shader "CrispyPin/LibGarbageExample"
 {
 	Properties
 	{
-
 		[Header(Raymarcher Properties)]
-		_MaxSteps ("Max steps", Int) = 256
-		_MaxDist ("Max distance", Float) = 256
-		_SurfDist ("Surface distance threshold", Range(0.00001, 0.05)) = 0.001
+		_MaxSteps ("Max steps", Int) = 128
+		_MaxDist ("Max distance", Float) = 128
+		_SurfDist ("Surface distance threshold", Range(0.0001, 0.05)) = 0.001
 
 	}
 	SubShader
 	{
 		Tags { "RenderType"="Opaque" }
-		Cull Off
+		Cull Front
 		LOD 100
 
 		Pass
@@ -21,22 +20,68 @@ Shader "CrispyPin/LibGarbageExample"
 			#pragma vertex vert
 			#pragma fragment frag
 
+			int _MaxSteps;
+			float _MaxDist;
+			float _SurfDist;
+			#define MAX_STEPS _MaxSteps
+			#define MAX_DIST _MaxDist
+			#define SURF_DIST _SurfDist
+
+			#define REFLECTIONS 3
+
+			#define LIGHT_FN lighting
+			#define SCENE_FN main
+
+			// #define SEPARATE_MATERIAL_AND_DIST_FUNCTIONS
+			// #define SCENE_FN separate_mat
+			// #define DISTANCE_FN separate_dist
+
+			// #define DISABLE_DEPTH
+			// #define DISCARD_ON_MISS
+			// #define USE_WORLD_SPACE
+			#define SCENE_SCALE 0.05
 			#include "libgarbage.cginc"
 
-			// #define MAIN_FN(PASS) float3 main##PASS ()\
+			SurfacePoint main(float3 p) {
+				Material grass = mat(float3(0.001, 0.1, 0.001), 0.3);
+				Material dirt = mat(float3(0.1, 0.04, 0.01), 0);
+				Material metal = mat(0.1, 1);
+				Material blue = mat(float3(0.05, 0.1, 0.2), 0);
 
-			#define MAIN_FN(PASS) SOME_MAGIC(PASS,\
-			{\
-				return float3(1,0,0);\
-			}\
-			)
-			// #include "libgarbage_end.cginc"
-			// #define DO_MAGIC(p) MAIN_FN(p)
-			DO_MAGIC
+				SurfacePoint d = mPlaneY(p, 0, grass);
+				d = qIntersect(d, mSphere(p, 9, dirt), 0.5);
+				d = qUnion(d, mSphere(p - float3(0, 2, 0), 2, metal));
+				d = qUnion(d, mTorus(rotX(p, _Time * 40 + UNITY_PI / 2), 5, 0.5, blue), 0.5);
+				d = qUnion(d, mTorus(rotZ(p, _Time * 40 + UNITY_PI / 2), 5, 0.5, blue), 0.5);
+				d = qUnion(d, mTorus(rotX(p, _Time * 40), 5, 0.5, blue), 0.5);
+				d = qUnion(d, mTorus(rotZ(p, _Time * 40), 5, 0.5, blue), 0.5);
+				// small spheres
+				float3 p2 = abs(rotY(p, -20 * _Time)) - float3(1.5, sin(_Time.y * 5) + 1, 1.5);
+				d = qUnion(d, mSphere(p2, 0.7, metal), 0.2);
+				return d;
+			}
 
-			// {return 0;}
-			// MAIN_FN(1) {return 0;}
+			SurfacePoint separate_mat(float3 p) {
+				Material blue = mat(float3(0.05, 0.1, 0.2), 0);
+				SurfacePoint d = mSphere(p, 1, blue);
+				return d;
+			}
 
+			float separate_dist(float3 p) {
+				return main(p).dist;
+			}
+
+			float3 lighting(Ray ray) {
+				if (ray.missed)
+					return lRenderSky(ray.dir, normalize(float3(4,2,1)));
+
+				float3 sun_dir = normalize(float3(4, 2, 1));
+				float3 col = 0;
+				col = ray.mat.col * lSun(ray.normal, sun_dir);
+				col *= lShadow(ray.hit_pos + ray.normal * SURF_DIST, sun_dir, 50);
+				col += ray.mat.col * lSky(ray.normal);
+				return col;
+			}
 
 			ENDCG
 		}

Assets/raymarched/lib/libgarbage_lighting.cginc

@@ -0,0 +1,63 @@
+
+// --------------------------------
+// common lighting operations
+// --------------------------------
+
+float3 lRenderSun(float3 ray_dir, float3 sun_dir) {
+	float alignment = min(acos(dot(ray_dir, sun_dir)), 1);
+	float sun_amount = smax(min(0.03 / alignment, 5) - 0.06, 0, 0.15);
+	return sun_amount* float3(0.8, 0.4, 0.1);
+}
+
+// a basic procedural sky
+float3 lRenderSky(float3 ray_dir, float3 sun_dir) {
+	float3 rendered_sun = lRenderSun(ray_dir, sun_dir);
+	// float3 rendered_sun = max(0, pow(dot(ray_dir, sun_dir) + 0.4, 10)-28) * float3(0.8, 0.4, 0);
+	return float3(0.7, 0.75, 0.8) - abs(ray_dir.y) * 0.5 + rendered_sun;
+	// return rendered_sun;
+}
+
+//calculate sky light
+float3 lSky(float3 normal, float3 sky_col = float3(0.5, 0.8, 0.9)) {
+	return sky_col * (0.5 + 0.5 * normal.y);
+}
+
+float lSun(float3 normal, float3 sun_dir, float3 sun_col = float3(7, 5.5, 3)) {
+	return sun_col * max(dot(normal, sun_dir), 0);
+}
+
+// soft shadows
+float lShadow(float3 p, float3 sun_dir, float sharpness = 8) {
+	float shadow = 1;
+	for (float ray_len = 0.001; ray_len < MAX_DIST / 2.0;)
+	{
+		float dist = DISTANCE_FN(p + sun_dir * ray_len);
+		if (dist < SURF_DIST) return 0;
+		shadow = min(shadow, sharpness * dist / ray_len);
+		ray_len += dist;
+	}
+	return shadow;
+}
+
+// --------------------------------
+// misc
+// --------------------------------
+
+float3 HSV(float h, float s, float v) {
+	h *= 6;
+	float c = s * v;
+	float x = c * (1 - abs(fmod(h, 2) - 1));
+	float m = v - c;
+	c += m;
+	x += m;
+
+	float3 colors[6] = {
+		float3(c, x, m),
+		float3(x, c, m),
+		float3(m, c, x),
+		float3(m, x, c),
+		float3(x, m, c),
+		float3(c, m, x)};
+
+	return colors[int(h)];
+}

Assets/raymarched/lib/libgarbage_lighting.cginc.meta

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Assets/raymarched/lib/libgarbage_operations.cginc

@@ -0,0 +1,141 @@
+// soft min of a and b with smoothing factor k
+float smin(float a, float b, float k) {
+	float h = max(k - abs(a-b), 0) / k;
+	return min(a, b) - h * h * h * k * (1 / 6.0);
+}
+
+// soft max of a and b with smoothing factor k
+float smax(float a, float b, float k) {
+	float h = max(k - abs(a - b), 0) / k;
+	return max(a, b) + h * h * h * k * (1 / 6.0);
+}
+
+Material mixMat(Material a, Material b, float fac) {
+	Material m;
+	m.col = lerp(a.col, b.col, fac);
+	m.gloss = lerp(a.gloss, b.gloss, fac);
+	return m;
+}
+
+Material mixMat(SurfacePoint a, SurfacePoint b) {
+	float fac = clamp(a.dist/(a.dist + b.dist), 0, 1);
+	return mixMat(a.mat, b.mat, fac);
+}
+
+// --------------------------------
+// base sdf operations
+// --------------------------------
+
+float qUnion(float a, float b) {
+	return min(a, b);
+}
+
+float qUnion(float a, float b, float smooth) {
+	return smin(a, b, smooth);
+}
+
+SurfacePoint qUnion(SurfacePoint a, SurfacePoint b) {
+	SurfacePoint o;
+	o.dist = min(a.dist, b.dist);
+	o.mat = mixMat(a, b);
+	return o;
+}
+
+SurfacePoint qUnion(SurfacePoint a, SurfacePoint b, float smooth) {
+	SurfacePoint o;
+	o.dist = smin(a.dist, b.dist, smooth);
+	o.mat = mixMat(a, b);
+	return o;
+}
+
+float qSub(float a, float b) {
+	return max(a, -b);
+}
+
+float qSub(float a, float b, float smooth) {
+	return smax(a, -b, smooth);
+}
+
+SurfacePoint qSub(SurfacePoint a, SurfacePoint b) {
+	SurfacePoint o;
+	o.dist = max(a.dist, -b.dist);
+	o.mat = a.mat;
+	return o;
+}
+
+SurfacePoint qSub(SurfacePoint a, SurfacePoint b, float smooth) {
+	SurfacePoint o;
+	o.dist = smax(a.dist, -b.dist, smooth);
+	o.mat = a.mat;
+	return o;
+}
+
+float qIntersect(float a, float b) {
+	return max(a, b);
+}
+
+float qIntersect(float a, float b, float smooth) {
+	return smax(a, b, smooth);
+}
+
+SurfacePoint qIntersect(SurfacePoint a, SurfacePoint b) {
+	SurfacePoint o;
+	o.dist = max(a.dist, b.dist);
+	o.mat = mixMat(a, b);
+	return o;
+}
+
+SurfacePoint qIntersect(SurfacePoint a, SurfacePoint b, float smooth) {
+	SurfacePoint o;
+	o.dist = smax(a.dist, b.dist, smooth);
+	o.mat = mixMat(a, b);
+	return o;
+}
+
+float qRound(float a, float radius) {
+	return a - radius;
+}
+
+SurfacePoint qRound(SurfacePoint a, float radius) {
+	a.dist -= radius;
+	return a;
+}
+
+// --------------------------------
+// spatial warping
+// --------------------------------
+
+float3 rotX(float3 p, float a) {
+	return mul(float3x3(1, 0, 0, 0, cos(a), -sin(a), 0, sin(a), cos(a)), p);
+}
+
+float3 rotY(float3 p, float a) {
+	return mul(float3x3(cos(a), 0, sin(a), 0, 1, 0, -sin(a), 0, cos(a)), p);
+}
+
+float3 rotZ(float3 p, float a) {
+	return mul(float3x3(cos(a), -sin(a), 0, sin(a), cos(a), 0, 0, 0, 1), p);
+}
+
+// repeats space every r units, centered on the origin
+float3 repXYZ(float3 p, float3 r) {
+	float3 o = p;
+	o = fmod(abs(p + r/2.0), r) - r/2.0;
+	o *= sign(o);
+	return o;
+}
+
+// repeats space every r units, centered on the origin, no sign
+float3 repXYZUnsigned(float3 p, float3 r) {
+	return fmod(abs(p + r / 2.0), r) - r / 2.0;
+}
+
+// repeats space
+inline float3 repXZ(float3 p, float x, float z) {
+	float3 o = p;
+	o.x = fmod(abs(p.x) + x / 2.0, x) - x / 2.0;
+	o.x *= sign(p.x);
+	o.z = fmod(abs(p.z) + z / 2.0, z) - z / 2.0;
+	o.z *= sign(p.z);
+	return o;
+}

Assets/raymarched/lib/libgarbage_operations.cginc.meta

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Assets/raymarched/lib/libgarbage_shapes.cginc

@@ -0,0 +1,53 @@
+
+#define _MAT_VARIANT1(NEW_NAME, BASE_FN, TYPE_1, ARG_1) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1);\
+		o.mat = mat;\
+		return o;\
+	}
+
+#define _MAT_VARIANT2(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1, ARG_2);\
+		o.mat = mat;\
+		return o;\
+	}
+
+#define _MAT_VARIANT3(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2, TYPE_3, ARG_3) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, TYPE_3 ARG_3, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1, ARG_2, ARG_3);\
+		o.mat = mat;\
+		return o;\
+	}
+
+//
+// Most of these are taken from https://iquilezles.org/articles/distfunctions/
+// Thank you Inigo Quilez <3
+
+float sdBox(float3 p, float3 size) {
+	float3 q = abs(p) - size / 2.0;
+	return length(max(q, 0)) + min(max(q.x, max(q.y, q.z)), 0);
+}
+_MAT_VARIANT1(mBox, sdBox, float3, size)
+
+float sdSphere(float3 p, float radius) {
+	return length(p) - radius;
+}
+_MAT_VARIANT1(mSphere, sdSphere, float, radius)
+
+float sdTorus(float3 p, float radius, float thickness) {
+	float2 q = float2(length(p.xz) - radius, p.y);
+	return length(q) - thickness;
+}
+_MAT_VARIANT2(mTorus, sdTorus, float, radius, float, thickness)
+
+float sdPlaneY(float3 p, float height) {
+	return p.y - height;
+}
+_MAT_VARIANT1(mPlaneY, sdPlaneY, float, height)
+
+
+

Assets/raymarched/lib/libgarbage_shapes.cginc.meta

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