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Exporting the right AOVs (Render Elements) is the simplest way to keep grading, relighting, and approvals fully non-destructive. Here’s a focused checklist to ensure your composites stay flexible without re-rendering.
- Core beauty decomposition
- Start with a predictable set: Diffuse Filter (Albedo), Lighting, GI, Reflection, Refraction, Emission. Include Specular/Coat/Sheen where applicable to your V-Ray version and shader stack.
- Diffuse Filter × (Lighting + GI) reconstructs the diffuse component cleanly and avoids double tonemapping in comp.
- Keep Reflection and Refraction separate for independent control of highlights vs. transmissive energy.
- Masking that holds up in comp
- Use Cryptomatte for anti-aliased, ID-agnostic mattes by Object, Material, or Asset name. Ensure unique names and clean namespaces.
- Add MultiMatte for art-directed groups. One MultiMatte gives you three masks (R/G/B); set anti-aliasing on and keep IDs unique.
- Legacy ID passes (Object/Material ID Color) can be useful, but prefer Cryptomatte for edges and motion blur.
- Relighting without re-render
- Light Select per key/fill/rim/environment lets you rebalance light families. Choose Contribution or separate Direct/Indirect modes for more control.
- Use Light Mix during lookdev; once approved, “Generate from Light Mix” to produce Light Select AOVs for final renders.
- Essential data passes
- Z-Depth for DOF and fog; set a sensible range to maximize precision.
- Normals (typically world-space) and World Position for relighting, edge sheen, and advanced grade isolation.
- Velocity for post motion blur; confirm shutter settings match your camera.
- AO via VRayDirt or VRayExtraTex as a separate pass to layer contact detail tastefully.
- For data passes (Normals/Position/Velocity), disable texture filtering and save at 32-bit float to avoid banding.
- Denoising strategy
- Output a Denoiser element plus the Noisy Beauty. In comp, you can blend denoised layers selectively to preserve fine detail where it matters.
- NVIDIA AI Denoiser is great for rapid iterations; V-Ray Denoiser offers more control for finals.
- File format and color
- Prefer multi-channel OpenEXR. Use 32‑bit float for beauty and data passes; 16‑bit is often fine for masks and matte IDs.
- Keep everything scene-linear; don’t bake VFB color corrections into the saved AOVs. Save your VFB stack (or LUT/OCIO settings) separately and reapply in comp.
- Adopt a consistent color pipeline (e.g., ACEScg or sRGB/Rec.709) across DCC, VFB, and compositing app.
- Common pitfalls to avoid
- Over-clamping can hide fireflies but also damages highlights in AOVs. Use reasonable Max Ray Intensity and address hot pixels at the source.
- Check “Affect Diffuse/Specular” on lights and materials so contributions appear in the expected AOVs.
- Name AOVs consistently to simplify template comps and automation.
Pro tip: build a scene template that preloads your AOV set and Light Select conventions. For licensing, workflow consulting, and upgrades, connect with NOVEDGE. If you need help choosing the right V-Ray edition or add‑ons, the team at NOVEDGE can guide you based on your DCC, GPU/CPU setup, and pipeline goals.
