The previous commit framed the empty capture as "the 3D draws never reach
CaptureShipDrawForRE" and proposed a static comparison to find out why. The
comparison was done and it refutes the framing.
The discriminator for ship geometry is stride=24 prim=4 with a large vcount -
xbg7-mesh.md records a real one as stride=24 vcount=10891 indices=18 prim=4. Not
"positions outside the screen rectangle", which is what I used and is a bad test:
a UI sprite placed at (137,308) passes it.
By the correct test this run's capture has exactly one prim=4 draw, a 6-vertex
full-screen quad, and the 2.9 MB file I was comparing against has NO prim=4 draws
at all. That file is a UI capture: 1303 of its 1582 draws are stride=24 prim=13,
which two other docs in this corpus already identify as the UI sprite shader. The
"1300 3D draws" it appeared to contain were UI sprite coordinates counted by the
bad test.
So the capture recorded exactly what was on screen. The tutorial's opening is an
empty starfield, the player's own ship and a HUD - no capital ship. And
ship-placement-runtime-capture.md has always stated the procedure: play into the
mission, frame the ship side-on, press F10.
What remains is therefore not a code question but a gameplay one: reach a real
mission and frame a capital ship. Worth stating that the original capture was
taken interactively on HW Vulkan, and this container runs lavapipe.
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