scene:context-of

(scene:context-of v)

The metal:context the viewer draws through -- the escape hatch to the drawing surface, for a pass of your own on top of the scene. Part of the scene package, a 3-D viewer for geom solids written in rontolisp over metal and appkit and loaded on first use: macOS (java -jar, the rontolisp binary, or a compiled .class / .jar; never a .wasm), with a display. See the solid modeling guide.

CL-USER> (metal:set-clear-color (scene:context-of *v*) '(0.0 0.0 0.0 1.0))
NIL