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#ifndef __CUSTOM31_INC
#define __CUSTOM31_INC
#include "globals.cginc"
#include "interpolators.cginc"
float map(float3 p) {
return length(p) - 0.1;
}
void apply_custom31_world(v2f i, inout Pbr pbr, inout float3 normal_tangent) {
#if defined(_CUSTOM31_WORLD)
// We will raymarch in (tangent, binormal, normal) coordinates.
// Make an expanded homogeneous tbn matrix to support moving back and forth.
// This first incarnation moves from world to tangent.
float4x4 tbn = float4x4(
pbr.tbn[0], 0,
pbr.tbn[1], 0,
pbr.tbn[2], 0,
0, 0, 0, 1);
tbn = mul(tbn, unity_WorldToObject);
float3 ro = mul(tbn, float4(i.worldPos, 1));
float3 rd = normalize(mul((float3x3) tbn, i.worldPos - _WorldSpaceCameraPos));
float d_acc = 0;
float d;
const float MIN_DIST = 1e-3;
const float MAX_DIST = 1;
[loop]
for (uint ii = 0; ii < 10; ++ii) {
float3 p = ro + rd * d_acc;
d = map(p);
d_acc += d;
if (d < MIN_DIST) {
break;
}
if (d > MAX_DIST) {
break;
}
}
if (d < MIN_DIST) {
pbr.albedo.xyz = 1;
} else {
pbr.albedo.xyz = 0;
}
float3 p = ro + rd * d_acc;
p = mul(float4(p, 1), tbn);
#endif
}
#endif // __CUSTOM31_INC
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