sdf.mirror (procNode)

The space mirrored across planes through a centre, so half a shape becomes a symmetric whole. A shape is a field of position: nothing is evaluated until something reads it, such as sdf.mesh, sdf.sample or field.substitute.

Inputs

• sdf (Sdf): The shape whose positive side is mirrored. Anything of it on the negative side of a mirrored axis is replaced by the mirrored copy.
• axes (String, default "x"): Which axes are mirrored, as a run of axis letters: "x", "y", "z", "xy", "xz", "yz" or "xyz". "x" reflects left to right, "xz" gives four-fold symmetry about the vertical, "xyz" all eight octants.
• center (Vec3, default (0, 0, 0)): Where the mirror planes cross.

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 point is read at its absolute offset from center on each mirrored axis. On a mirrored axis the bounds become symmetric about center, reaching as far as the shape's furthest bound on that axis.

Example

local half = g.sdf.sphere({ radius = 0.3, center = vector.create(0.5, 0, 0) })
local pair = g.sdf.mirror({ sdf = half, axes = "x" })
local mesh = g.sdf.mesh({ sdf = pair, resolution = 16 }).geometry