The post-processing chain's remaining effects: depth of field, motion blur, outline, LUT, lens effects, custom pass

[pasquelin]

Why

Split from #349 (post-processing chain): six effects remain, each its own pull request. This issue holds them until a lead takes one; the CTO then splits that effect into its own issue.

To do

• Depth of field
• Motion blur
• Outline
• 3D LUT
• Vignette, grain and chromatic aberration
• Custom pass (with Custom shader materials: user shading and vertex functions inside the one lighting model #351)

Code context

The effect chain #651 and #692 built (world.effects), the composed image of #349.

Proof

Per effect: a test by behaviour, the measurer's capture on both backends, the cost of the pass within the frame budget.

Links

Split from #349. Related #351.

[pasquelin]

MISSING from the examples worker (#880, outline-the-selection): effect.outline({ objects, color, thickness }) — outline of the selected objects.

• The outline effect takes a set of objects, a colour and a thickness; the parked example unparked.

[pasquelin]

To do moved from #558 (CTO, 28 Sept., narrowing at claim time): WebGL2 draws multiply and subtractive surfaces under an effect pass. #349 made WebGL2 drop the effect chain for a frame that holds such a surface, with the notice effects-refused-blending (world/diagnostic/worldNotices.ts:101-119, tests world/render/composeRefusal.test.ts). The degrade is removed: the chain draws those blendings on WebGL2 as WebGPU does. Test on the WebGL2 path.