Raymarching

Library to render signed distance fields with raymarching in Unity.

Usage

1. Attach a Raymarcher component to the camera.

2. Select the material used to render. Two materials are included in the package, RaymarcherUnion and RaymarcherSmoothUnion.

3. Add a RaymarchPrimitive component to a gameobject.

4. Select the parameters and material used to render the primitive.

5. Add the RaymarchPrimitive component to the primitives list of the Raymarcher component.

Now you can move, rotate or scale the raymarch primitive with the Unity transform tools.

Advanced

It is also posible to implement a more complex interaction between primitives creating a raymarcher shader. To create a raymarcher shader go to the context menu Create > Raymarcher Shader. The shader contains the function RaymarchData SignedDistanceField(float3 position) that is executed in the fragment shader. The function does the following calculations:

1. Iterates over the primitives array.
2. Transforms the target position from world space to the primitive local space.
3. Calculates the distance using the signed distance function of the primitive at the transformed position.
4. The union operator data.distance = opUnion(data.distance, d) is applied to the primitives. Other operators can be found in the files SignedDistanceOperations.hlsl and SignedDistanceBooleanOperations.hlsl.
5. Returns the data of the closest primitive.