Show the dice faintly in a glossy table - #379
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The owner asked for the dark glass to reflect the dice "a bit, not perfectly". Filament's screen-space reflections were read against 1.76.1's shaders first and ruled out: they reflect everything on screen, so the walls would lay a dark band along their foot (the band switching ambient occlusion off removed); their roughness blur is in world units and comes out sharp in this millimetre scene; and they fade every ray that turns back towards the camera, which from the default straight-down view is nearly all of them. Instead a glossy floor gets a planar reflection of the dice alone: a second view from the camera turned over in the floor, a quarter of the screen each way, no shadows and no post pass, with the tray on a layer it does not see. The floor, a third material compiled on first use, adds that picture times its own Fresnel term and the table's strength and lowers its reflectance as much where a die is, so a white die shows as a soft pale patch and a dark one as a darker one. The small picture is the blur and most of why it is cheap. Whether a table reflects is read off its roughness (under 0.3; dark glass at 0.1 is two-thirds strength), so the format does not change and felt, oak and plain stay on the opaque material, drawing exactly as before at no cost. The rendered harness gains --table so the cost can be measured on dark-glass (decision 93). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Owner request: the dark glass should reflect the dice a bit, not perfectly.
Technique (decision 93): a planar reflection of the dice only.
GLASSmaterial variant samples that texture and adds it, weighted by Fresnel × the table's strength. The variant is compiled lazily and cached.Why not Filament's screen-space reflections (from reading the 1.76.1 shader source):
Which tables reflect: derived from roughness, with no format change. Strength = 1 − roughness/0.3, clamped. Dark glass (0.1) gets 2/3; felt, oak and plain get none and pay nothing.
On the Pixel 10a (the whole stack):
:render:filamentdevice suite 51/51, with the newReflectionDeviceTest:Judge on the phone: is it too subtle?
Reflection's strength mapping is the knob.Also:
tools/harness.sh --rendered --table <id>can now pick a table, to measure the cost on dark glass.Docs:
docs/physics-and-rendering.md("The dice in a glossy table"),docs/tables.md,docs/build-setup.md, decision 93.Based on #378.
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