height_field: the height field with its casts, query and mover - #7
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aephysics.height_field, Box3D's height_field.c in Aether: heights quantised to a global range so neighbouring fields line up, a material per cell with holes, the edge flags of every triangle against its four neighbours, either winding; the overlap, the ray and shape casts by a DDA walk of the swept box's leading corner through the cells, the character mover's planes and the box query. test_height_field.ae: the reference's create, index mapping on an asymmetric grid, winding normals, flat-field ray, overlap at the surface, the vertical casts straddling a cell boundary, the shape and ray casts against a brute force over every triangle of a wave, and the back side culled for both windings (the file roundtrip is not ported); plus the flags of a ridge and of holes, a scaled field, the box query, the mover. 113 checks. bench/height_field.ae against bench/height_field_box3d.c on a 512 x 512 wave with holes: the same hits and sums on every phase; the box query at parity, the ray walk 1.4x, the build 1.5x, the shape cast 2.1x.
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The ninth layer: Box3D's height_field.c as
aephysics.height_field.HEIGHT_FIELD_HOLE, edge flags per triangle against the diagonal and the four neighbours, either winding (get_height_field_triangleswaps the edge bits with the vertices).test_height_field.ae: the reference's subtests minus the file roundtrip, with the shape and ray casts checked against a brute force over every triangle of a wave (600 + 200 casts), plus the flags of a ridge and of holes, a scaled field, the query and the mover. 113 checks.bench/height_field.aevsbench/height_field_box3d.c(512 x 512 wave with holes): identical hits and sums; query at parity, rays 1.4x, build 1.5x, shape casts 2.1x. Recorded inbench/RESULTS.md.