sdf.intersect (procNode)

Only what is inside both shapes: the maximum of their distances. With blend above 0 the seam around the overlap is filleted. A shape is a field of position: nothing is evaluated until something reads it, such as sdf.mesh, sdf.sample or field.substitute.

Inputs

• a (Sdf): One of the two shapes. Intersection is symmetric.
• b (Sdf): The other shape.
• blend (Float, default 0.0): How wide the fillet where the two shapes meet is, in the shapes' own units. At 0 the two meet at a hard crease. Above 0 their distances bend into each other over a band this wide.
• blend_kind (String, default "polynomial"): Which smooth minimum shapes the fillet, read only when blend is above 0: "polynomial" reaches the plain result exactly at the edge of the band, "exponential" never quite reaches it, "root" is the smoothest and widest reaching, and "chamfer" cuts the corner off with a flat 45-degree facet.

Outputs

• sdf (Sdf): the shape, a record of field (the signed distance at each point of space, negative inside) and bounds ({ min, max }, the box the shape stays inside).

The field is sdf.smooth_max of the two distances (a plain maximum at blend 0). The bounds are the overlap of the two shapes' bounds, grown by blend; an infinite bound gives way to a finite one, so intersecting with sdf.plane keeps the other shape's bounds.

Example

local shape = g.sdf.intersect({ a = g.sdf.sphere({ radius = 1 }), b = g.sdf.plane({ normal = vector.create(0, 1, 0) }) })
local mesh = g.sdf.mesh({ sdf = shape, resolution = 16 }).geometry