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-rw-r--r--custom30.cginc142
1 files changed, 119 insertions, 23 deletions
diff --git a/custom30.cginc b/custom30.cginc
index 56392d6..75522f1 100644
--- a/custom30.cginc
+++ b/custom30.cginc
@@ -23,9 +23,12 @@ struct Custom30Output {
float depth;
};
-float3 GetFragToOrigin(v2f i) {
- // Vector from fragment to origin
- return float3(-1, 1, 1) * (i.color * 2.0f - 1.0f) / i.color.a;
+float3 GetFragToOrigin(v2f i, float3x3 tangentToWorld) {
+ // Vector from fragment to origin (tangent space)
+ float3 vec_tan = (i.color * 2.0f - 1.0f) / i.color.a;
+ float3 vec_world = mul(tangentToWorld, vec_tan);
+ float3 vec_obj = mul((float3x3)unity_WorldToObject, vec_world);
+ return vec_obj;
}
float cut_with_box(float3 p, float d, float3 box_size) {
@@ -168,13 +171,20 @@ float3 BasicCube_normal(float3 p) {
return normalize(n);
}
-Custom30Output BasicCube(v2f i) {
- float3 objSpaceCameraPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
+Custom30Output BasicCube(v2f i, float4x4 tangentToWorld) {
+ float4x4 worldToTangent = transpose(tangentToWorld);
+ float4x4 objectToTangent = mul(worldToTangent, unity_ObjectToWorld);
+ float4x4 tangentToObject = transpose(objectToTangent);
- float3 frag_to_origin = GetFragToOrigin(i);
+ // Vector from fragment to origin in tangent space.
+ float3 frag_to_origin = (i.color * 2.0f - 1.0f) / i.color.a;
+
+ float3 tanSpaceCameraPos = mul(worldToTangent,
+ float4(_WorldSpaceCameraPos, 1.0));
float3 ro = -frag_to_origin;
- float3 rd = normalize(i.objPos - objSpaceCameraPos);
+ float3 rd = normalize(
+ mul(worldToTangent, float4(i.worldPos, 1.0)).xyz - tanSpaceCameraPos);
ro -= rd * _Custom30_ro_Offset;
@@ -199,13 +209,14 @@ Custom30Output BasicCube(v2f i) {
#endif
float3 objPos = ro + rd * d_acc;
// Transform from SDF space back to object space
- float3 objSpacePos = objPos + (i.objPos + frag_to_origin);
+ float3 frag_to_origin_obj = mul(tangentToObject, float4(frag_to_origin, 1.0));
+ float3 objSpacePos = objPos + (i.objPos + frag_to_origin_obj);
o.objPos = objSpacePos;
float4 clipPos = UnityObjectToClipPos(objSpacePos);
o.depth = clipPos.z / clipPos.w;
float3 sdfNormal = BasicCube_normal(objPos);
- o.normal = UnityObjectToWorldNormal(sdfNormal);
+ o.normal = mul(tangentToWorld, sdfNormal);
return o;
}
@@ -231,13 +242,22 @@ float3 BasicWedge_normal(float3 p) {
return normalize(n);
}
-Custom30Output BasicWedge(v2f i) {
- float3 objSpaceCameraPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
+Custom30Output BasicWedge(v2f i, float4x4 tangentToWorld) {
+ float4x4 worldToTangent = transpose(tangentToWorld);
+ float4x4 objectToTangent = mul(worldToTangent, unity_ObjectToWorld);
+ float4x4 tangentToObject = transpose(objectToTangent);
+
+ // Vector from fragment to origin in tangent space.
+ float3 frag_to_origin = (i.color * 2.0f - 1.0f) / i.color.a;
- float3 frag_to_origin = GetFragToOrigin(i);
+ float3 tanSpaceCameraPos = mul(worldToTangent,
+ float4(_WorldSpaceCameraPos, 1.0));
float3 ro = -frag_to_origin;
- float3 rd = normalize(i.objPos - objSpaceCameraPos);
+ float3 rd = normalize(
+ mul(worldToTangent, float4(i.worldPos, 1.0)).xyz - tanSpaceCameraPos);
+
+ ro -= rd * _Custom30_ro_Offset;
float d;
float d_acc = 0;
@@ -260,13 +280,14 @@ Custom30Output BasicWedge(v2f i) {
#endif
float3 objPos = ro + rd * d_acc;
// Transform from SDF space back to object space
- float3 objSpacePos = objPos + (i.objPos + frag_to_origin);
+ float3 frag_to_origin_obj = mul(tangentToObject, float4(frag_to_origin, 1.0));
+ float3 objSpacePos = objPos + (i.objPos + frag_to_origin_obj);
o.objPos = objSpacePos;
float4 clipPos = UnityObjectToClipPos(objSpacePos);
o.depth = clipPos.z / clipPos.w;
- float3 sdfNormal = BasicWedge_normal(objPos) * float3(-1, 1, 1);
- o.normal = UnityObjectToWorldNormal(sdfNormal);
+ float3 sdfNormal = BasicWedge_normal(objPos);
+ o.normal = mul(tangentToWorld, sdfNormal);
return o;
}
@@ -320,13 +341,22 @@ float3 BasicPlatform_normal(float3 p) {
return normalize(n);
}
-Custom30Output BasicPlatform(v2f i) {
- float3 objSpaceCameraPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
+Custom30Output BasicPlatform(v2f i, float4x4 tangentToWorld) {
+ float4x4 worldToTangent = transpose(tangentToWorld);
+ float4x4 objectToTangent = mul(worldToTangent, unity_ObjectToWorld);
+ float4x4 tangentToObject = transpose(objectToTangent);
+
+ // Vector from fragment to origin in tangent space.
+ float3 frag_to_origin = (i.color * 2.0f - 1.0f) / i.color.a;
- float3 frag_to_origin = GetFragToOrigin(i);
+ float3 tanSpaceCameraPos = mul(worldToTangent,
+ float4(_WorldSpaceCameraPos, 1.0));
float3 ro = -frag_to_origin;
- float3 rd = normalize(i.objPos - objSpaceCameraPos);
+ float3 rd = normalize(
+ mul(worldToTangent, float4(i.worldPos, 1.0)).xyz - tanSpaceCameraPos);
+
+ ro -= rd * _Custom30_ro_Offset;
float d;
float d_acc = 0;
@@ -347,13 +377,79 @@ Custom30Output BasicPlatform(v2f i) {
clip(epsilon - d);
#endif
float3 objPos = ro + rd * d_acc;
- float3 objSpacePos = objPos + (i.objPos + frag_to_origin);
+ // Transform from SDF space back to object space
+ float3 frag_to_origin_obj = mul(tangentToObject, float4(frag_to_origin, 1.0));
+ float3 objSpacePos = objPos + (i.objPos + frag_to_origin_obj);
+ o.objPos = objSpacePos;
+ float4 clipPos = UnityObjectToClipPos(objSpacePos);
+ o.depth = clipPos.z / clipPos.w;
+
+ float3 sdfNormal = BasicPlatform_normal(objPos);
+ o.normal = mul(tangentToWorld, sdfNormal);
+
+ return o;
+}
+#endif
+
+#if defined(_CUSTOM30_RAINBOW)
+float Rainbow_map(float3 p) {
+ return length(p) - 2;
+}
+
+float3 Rainbow_normal(float3 p) {
+ float epsilon = 1E-3;
+ float center_d = Rainbow_map(p);
+ float3 n = float3(
+ Rainbow_map(p + float3(epsilon, 0, 0)) - center_d,
+ Rainbow_map(p + float3(0, epsilon, 0)) - center_d,
+ Rainbow_map(p + float3(0, 0, epsilon)) - center_d);
+ return normalize(n);
+}
+
+Custom30Output Rainbow(v2f i, float4x4 tangentToWorld) {
+ float4x4 worldToTangent = transpose(tangentToWorld);
+ float4x4 objectToTangent = mul(worldToTangent, unity_ObjectToWorld);
+ float4x4 tangentToObject = transpose(objectToTangent);
+
+ // Vector from fragment to origin in tangent space.
+ float3 frag_to_origin = (i.color * 2.0f - 1.0f) / i.color.a;
+
+ float3 tanSpaceCameraPos = mul(worldToTangent,
+ float4(_WorldSpaceCameraPos, 1.0));
+
+ float3 ro = -frag_to_origin;
+ float3 rd = normalize(
+ mul(worldToTangent, float4(i.worldPos, 1.0)).xyz - tanSpaceCameraPos);
+
+ ro -= rd * _Custom30_ro_Offset;
+
+ float d;
+ float d_acc = 0;
+ float epsilon = 1E-2;
+ float max_d = 1.73205081f * 2.0f;
+ [loop]
+ for (uint ii = 0; ii < CUSTOM30_MAX_STEPS; ++ii) {
+ float3 p = ro + rd * d_acc;
+ d = Rainbow_map(p);
+ d_acc += d;
+ if (d < epsilon) break;
+ if (d_acc > max_d) break;
+ }
+
+ Custom30Output o;
+#if !defined(_DEPTH_PREPASS)
+ clip(epsilon - d);
+#endif
+ float3 objPos = ro + rd * d_acc;
+ // Transform from SDF space back to object space
+ float3 frag_to_origin_obj = mul(tangentToObject, float4(frag_to_origin, 1.0));
+ float3 objSpacePos = objPos + (i.objPos + frag_to_origin_obj);
o.objPos = objSpacePos;
float4 clipPos = UnityObjectToClipPos(objSpacePos);
o.depth = clipPos.z / clipPos.w;
- float3 sdfNormal = BasicPlatform_normal(objPos) * float3(-1, 1, 1);
- o.normal = UnityObjectToWorldNormal(sdfNormal);
+ float3 sdfNormal = Rainbow_normal(objPos);
+ o.normal = mul(tangentToWorld, sdfNormal);
return o;
}
generated by cgit v1.2.3 (git 2.39.1) at 2026-06-04 06:04:16 +0000