Astra, Opus and the revolved mesher

Four revolved profiles: a multi-step shaft, a rounded filleted body and two hollow profiles with inner and outer features. Explicitly synthetic demonstration CAD.

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Multi-step shaft with chamfered tip

revshow_multistep_chamfer

Original CAD · half-meridian profile (axial →, radial ↑)

GPT 6 Astra

geometry pass

17 seed parts · 4500 nominal hexes
Min SJ 0.6964 / doubled 0.7006
1 full checks · 2.28 min
$1.02 · Standard API equivalent

Realized source-part layout · meridian section

2D meridian mesh section · SJ

3D mesh · SJ

Nominal VTU · Doubled VTU

Opus 5.5

geometry pass

1 seed parts · 3584 nominal hexes
Min SJ 0.6946 / doubled 0.6996
1 full checks · 4.03 min
$0.93 · Claude CLI usage

2D meridian mesh section · SJ

3D mesh · SJ

Nominal VTU · Doubled VTU

Deterministic revolved mesher

geometry pass

5 seed parts · 6180 nominal hexes
Min SJ 0.6855 / doubled 0.6860
1 full checks · 0.043 s
No API spend

2D meridian mesh section · SJ

3D mesh · SJ

Nominal VTU · Doubled VTU

Filleted tapered body with rounded ends

revshow_fillet_domed_pin

GPT 6 Astra

geometry pass

27 seed parts · 1824 nominal hexes
Min SJ 0.5774 / doubled 0.5774
1 full checks · 2.22 min
$0.93 · Standard API equivalent

2D meridian mesh section · SJ

3D mesh · SJ

Nominal VTU · Doubled VTU

Opus 5.5

geometry pass

1 seed parts · 1740 nominal hexes
Min SJ 0.6428 / doubled 0.6428
1 full checks · 6.55 min
$1.34 · Claude CLI usage

2D meridian mesh section · SJ

3D mesh · SJ

Nominal VTU · Doubled VTU

Both densities pass native checks, but the tiny torus fillet face has zero attributed boundary quads. Neighboring cells span it. Astra attributes 48/192 quads to the fillet. Capture is 0/0 eligible sharp edges for both authors.

Deterministic revolved mesher

refused

0 mesh checks · no mesh/SJ available
0.002 s compiler time

No layout or mesh emitted.

pole-revolve also declined: pole-revolve: shallow-junction-13.1deg (two-surface ring inheritance converges at rate cos^2 of the junction angle under a 50-iteration cap, so at 13.1° it does not converge; a tangent or shallow junction needs every ring node pinned, which this construction has no mechanism for)]