rhombSDF: Diamond Shape Distance Field

Composite Geometry from Triangle Intersection

The rhombSDF function creates a rhombus (diamond) shape by combining two triangular distance fields. This approach demonstrates geometric composition through the maximum operation of transformed triangle primitives.

Mathematical Foundation

The rhombus is constructed by taking the maximum distance of two triangles:

$$d_{rhombus}(p) = \max(d_{tri}(p), d_{tri}(p'))$$

where $p'$ represents the vertically flipped coordinate $(p_x, 1 - p_y)$ for the second triangle.

The maximum operation creates the intersection of the two triangular half-spaces, forming the characteristic diamond shape with four equal sides meeting at right angles.

Function Signature

Parameter	Type	Description
st	vec2	2D coordinate position

Implementation Demonstrations

ライブエディター

const fragment = () => {
      const dist = rhombSDF(uv)
      return vec4(vec3(dist), 1)
}