cvr-props/Assets/raymarched/lib/libgarbage_shapes.cginc

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2023-07-24 08:42:25 +02:00
#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 sdCappedTorus(float3 p, float2 sc, float r1, float r2) {
p.x = abs(p.x);
float k = (sc.y * p.x > sc.x * p.z) ? dot(p.xz, sc) : length(p.xz);
return sqrt(dot(p, p) + r1 * r1 - 2.0 * r1 * k) - r2;
}
_MAT_VARIANT3(mCappedTorus, sdCappedTorus, float2, sc, float, r1, float, r2)
float sdPlaneY(float3 p, float height) {
return p.y - height;
}
_MAT_VARIANT1(mPlaneY, sdPlaneY, float, height)
float sdHexPrism(float3 p, float width, float height) {
const float3 k = float3(-0.8660254, 0.5, 0.57735);
p = abs(p);
p.xz -= 2.0 * min(dot(k.xy, p.xz), 0) * k.xy;
float2 d = float2(length(p.xz - float2(clamp(p.x,-k.z * width, k.z * width), width)) * sign(p.z - width), p.y - height);
return min(max(d.x, d.y), 0) + length(max(d, 0));
}
_MAT_VARIANT2(mHexPrism, sdHexPrism, float, width, float, height)
float sdInfCylinder(float3 p, float3 c) {
return length(p.xz - c.xy) - c.z;
}
_MAT_VARIANT1(mInfCylinder, sdInfCylinder, float3, c)
float sdCylinder(float3 p, float r, float h) {
float2 d = abs(float2(length(p.xz), p.y)) - float2(r, h);
return min(max(d.x, d.y), 0) + length(max(d, 0));
}
_MAT_VARIANT2(mCylinder, sdCylinder, float, r, float, h)
float sdHelix(float3 p, float r1, float r2, float incline) {
float x2 = length(p.xz) - r1; // vertical plane
float angle = atan2(p.z, p.x); // angle around y axis
float y = angle * incline - p.y;
y = fmod(y, UNITY_PI * incline * 2) + UNITY_PI * incline;
float dist = length(float2(x2, y)) - r2;
return dist * 0.8;
}
_MAT_VARIANT3(mHelix, sdHelix, float, r1, float, r2, float, incline)
float sdLine(float3 p, float3 a, float3 b, float r) {
float3 pa = p - a;
float3 ba = b - a;
float h = clamp(dot(pa, ba) / dot(ba, ba), 0, 1);
return length(p- a - (b-a) * h) - r;
}
_MAT_VARIANT3(mLine, sdLine, float3, a, float3, b, float3, r)
float sdGyroid(float3 p, float scale, float bias, float thickness) {
float dist = abs(dot(sin(p * scale), cos(p.zxy * scale)) + bias) - thickness;
dist *= .58 / scale;
return dist;
}
_MAT_VARIANT3(mGyroid, sdGyroid, float, scale, float, bias, float, thickness)
SurfacePoint mFromDist(float d, Material mat = DEFAULT_MAT) {
SurfacePoint o;
o.dist = d;
o.mat = mat;
return o;
}