Three Physical Material

Standard Material gets you plastic, metal and cloth. The moment your subject is a glass bottle, a lacquered car body, or a soap bubble, you need effects those surfaces don't have - real refraction, a clearcoat layer, hue-shifting iridescence. WASThreePhysicalMaterial is Standard Material plus exactly those effects, and it's the node that makes the Three family capable of "product render" instead of "game asset." Everything extra starts at 0.0, so it behaves exactly like a standard material until you turn the effects on.

What it does

The headline features, each with its own honest description:

• transmission - the glass one. Makes a surface see-through by refracting light rather than going transparent, which is why it looks like glass instead of tinted air. It wants friends to read as a solid: a thickness, an index of refraction (ior), and an attenuation_color (with an attenuation_distance) to read as tinted. Thin panes want side double so both walls refract.
• clearcoat / clearcoat_roughness - a second glossy layer over the base, the lacquer on a car.
• sheen - the soft rim velvet has. Uses sheen_color and sheen_roughness.
• iridescence - hue shifts with viewing angle. Soap bubbles, oil slicks.
• anisotropy - directionally-stretched reflections, for brushed metal.
• emissive / emissive_intensity - gives off its own light. This one matters beyond looks: Three Path Trace Render treats emissive surfaces as lights in their own right, so an emissive panel genuinely illuminates a traced scene.

You get the full standard-material toolkit underneath - color, roughness, metalness, opacity, transparent, side, normal/bump/displacement maps, specular intensity and color - plus maps for the new channels (transmission, clearcoat, specular, and so on).

What actually matters in practice

Start with the workhorse settings and add one effect at a time, because the failure modes are easy to misdiagnose:

• Glass that looks like plastic = transmission on but thickness and ior never set. The description is blunt: transmission "wants a thickness and an index of refraction to read as a solid."
• Glass that looks tinted when it shouldn't = attenuation_color is doing its job. Attenuation is tint, so clear glass wants a neutral color and a generous attenuation_distance.
• Metal that reads black = no environment to reflect. This is true on Standard too, but worth re-checking here since the specular sheen multiplies the effect.

Where it fits

It's a drop-in THREE_MATERIAL for Three Mesh, and it's also an excellent partner to Three Environment - real reflections are half the reason to use physical materials at all. The cost note in the description is honest: everything at 0.0 behaves like a standard material "at a higher cost," so don't slap Physical on every mesh in a big scene just because it's the shiniest option. Reach for it where the effect is on screen.

Install

WASThreePhysicalMaterial ships with WAS Node Suite v3. Install via ComfyUI Manager (search WAS Node Suite v3) or:

cd ComfyUI/custom_nodes
git clone https://github.com/WASasquatch/was-node-suite-comfyui.git

Restart after. Requires ComfyUI 0.14.0+ and Python 3.10+. If the node's missing from Add Node, check features.threejs in <ComfyUI user dir>/was-node-suite/config.yaml - on by default in current releases.