#### [Ollin](../../../index.md) → [Examples](../../index.md) → [3D](../index.md) → Raymarching
---
## Raymarching
| [](raymarchedcastshadow.md) | [](raymarchedclay.md) | [](raymarcheddetailing.md) | [](raymarcheddistort.md) |
|---|---|---|---|
| [RaymarchedCastShadow](raymarchedcastshadow.md) | [RaymarchedClay](raymarchedclay.md) | [RaymarchedDetailing](raymarcheddetailing.md) | [RaymarchedDistort](raymarcheddistort.md) |
| [](raymarcheddomain.md) | [](raymarchedenvironment.md) | [](raymarchedfractals.md) | [](raymarchedgradient.md) |
| [RaymarchedDomain](raymarcheddomain.md) | [RaymarchedEnvironment](raymarchedenvironment.md) | [RaymarchedFractals](raymarchedfractals.md) | [RaymarchedGradient](raymarchedgradient.md) |
| [](raymarchedjoinery.md) | [](raymarchedplane.md) | [](raymarchedradial.md) | [](raymarchedreceiveshadow.md) |
| [RaymarchedJoinery](raymarchedjoinery.md) | [RaymarchedPlane](raymarchedplane.md) | [RaymarchedRadial](raymarchedradial.md) | [RaymarchedReceiveShadow](raymarchedreceiveshadow.md) |
| [](raymarchedsdf.md) | [](raymarchedsculpt.md) | [](raymarchedshadow.md) | [](raymarchedshapes.md) |
| [RaymarchedSDF](raymarchedsdf.md) | [RaymarchedSculpt](raymarchedsculpt.md) | [RaymarchedShadow](raymarchedshadow.md) | [RaymarchedShapes](raymarchedshapes.md) |
| [](raymarchedstretch.md) | | | |
| [RaymarchedStretch](raymarchedstretch.md) | | | |
This group covers the 3D SDF combinators: distance fields that merge, sphere-traced beside the meshes.
| Sketch | What it shows |
| --- | --- |
| [RaymarchedSDF](raymarchedsdf.md) | The 3D SDF combinators sphere-traced as one surface. Spheres melt together by smooth-union, and their colors blend through the seam. One sphere orbits, and a bite is carved out by subtraction. |
| [RaymarchedShapes](raymarchedshapes.md) | The raymarched primitive catalog beyond the first four (rounded box, cylinder, cone, octahedron, ellipsoid). Each is a field traced into the shared depth buffer. |
| [RaymarchedSculpt](raymarchedsculpt.md) | The scoped block form. Inside `smoothUnion(k:) { … }`, bare mesh calls (`drawSphere`, `drawCapsule`, `drawCone`, …) are captured as fields and melt into one traced surface. |
| [RaymarchedDomain](raymarcheddomain.md) | Domain operators. `repeated(spacing:count:)` tiles a unit cell into a finite lattice, and `mirrored(x:y:z:)` folds one built lobe into a symmetric form. The whole thing stays one surface. |
| [RaymarchedRadial](raymarchedradial.md) | Polar repetition. `repeatedRadially` folds one wedge into an evenly spaced rosette around an axis, with no draw cost per copy. |
| [RaymarchedPlane](raymarchedplane.md) | The infinite plane leaf. An unbounded ground is merged into the field and marched to the far plane, and it catches the shapes' soft shadows. |
| [RaymarchedStretch](raymarchedstretch.md) | Per-axis sizing. `stretched` is exact elongation, so a sphere becomes a capsule. Beside it, `scaled(x:y:z:)` is a true non-uniform scale, marched conservatively. |
| [RaymarchedGradient](raymarchedgradient.md) | Gradient paint on a merged field. A gradient `fill` paints the whole sphere-traced surface, sampled at each hit's projected screen position. |
| [RaymarchedEnvironment](raymarchedenvironment.md) | Raymarched fields lit by an environment. They get the same image-based lighting and traced reflections the meshes get. |
| [RaymarchedShadow](raymarchedshadow.md) | A field shadowing itself under `castShadows()`. A soft penumbra is marched toward the light and evaluated as part of the surface shading. |
| [RaymarchedCastShadow](raymarchedcastshadow.md) | A field casting a shadow onto meshes under a directional or point light (any key switches). Either the field renders into the 2D shadow map, or the lit mesh fragments march the field inline toward the light. |
| [RaymarchedReceiveShadow](raymarchedreceiveshadow.md) | A field receiving a mesh's cast shadow under a directional or point light (any key switches). The traced surface samples the 2D map, the shadow cube, or the acceleration structure at its hit. |
| [RaymarchedClay](raymarchedclay.md) | The sculpt block. The combine mode and melt amount are held as state, so a form reads top to bottom like working clay. |
| [RaymarchedJoinery](raymarchedjoinery.md) | Machined joints and hardware: chamfered and stepped unions, a hanging chain, a capped-torus hook. |
| [RaymarchedDetailing](raymarcheddetailing.md) | The detailing ops: fluted seams, engraved rings, grooved bands, beading, and a pipe bead left hanging where two bodies crossed. |
| [RaymarchedDistort](raymarcheddistort.md) | The sculpting distortions: twisted, bent, displaced, and roughened, one plinth each. |
| [RaymarchedFractals](raymarchedfractals.md) | The fractal leaves: a Mandelbulb, a Menger sponge, and a Mandelbox. Each is a distance estimate that the same sphere tracer draws. A menu picks one, and the bulb's power, the sponge's depth, and the box's scale are each a parameter of their own. |
Run one with `swift run Example-3D-Raymarching-`, for example `swift run Example-3D-Raymarching-RaymarchedSDF`.