V-Ray Tip: Non-destructive V-Ray Denoiser AOV Workflow

Use the Denoiser AOV to keep the Beauty pass pristine while gaining full, non-destructive control in comp. This workflow boosts iteration speed, reduces re-renders, and keeps your pipeline flexible. If you need licenses or upgrades, check NOVEDGE.

• Add the VRayDenoiser render element (AOV). This generates a separate denoised output plus the auxiliary Albedo/Normal guides the denoiser needs.
• Choose engine based on stage:
  • NVIDIA AI (OptiX): Fastest for lookdev/IPR on compatible GPUs.
  • Intel Open Image Denoise (OIDN): High-quality CPU denoise, great for finals.
  • V-Ray Denoiser: Stable, production-proven, balanced quality.
• Preserve the raw RGB/Beauty. Keep denoising in a separate AOV (or as an EffectsResult in the VFB), so the untouched Beauty remains available.
• Decide which passes to denoise:
  • Denoise: Beauty, Lighting, GI, Reflection/Refraction (as needed).
  • Do not denoise: Cryptomatte, Z-Depth, Velocity, Position, Normals (utility passes must stay clean for comp/math).
• Save 32-bit multilayer EXR. Include Beauty, denoised Beauty, selected denoised lighting passes, and the denoiser Albedo/Normal guides. For best results, also include a raw, non-denoised set of key passes.

Why this AOV approach matters

• Non-destructive: Toggle and balance denoise intensity in comp without rerendering.
• Art direction: Blend denoised over raw to keep microdetails on fabrics, hair, and edges.
• Pipeline safety: Utility AOVs stay mathematically correct for grading, relighting, and FX.
• Versioning: Store multiple denoise flavors (Mild/Medium/Strong) per frame if needed.

Quality tuning checklist before denoising

• Noise threshold: Aim ~0.02–0.04 for stills; ~0.04–0.06 for animation before denoise.
• Tame fireflies: Enable Subpixel mapping; use Clamp output (1.0–2.0) only if persistent hot pixels remain.
• GI stability: Prefer Brute Force + Light Cache (adequate LC samples) to avoid blotches the denoiser can’t clean elegantly.
• Textures: Avoid overly sharp normal/displacement at distance; ensure mip-mapping and sensible filtering.
• Animation: Keep sampling settings consistent across frames to reduce temporal shimmer after denoise.

Compositing recipe (Nuke/AE/Fusion)

• Load the EXR. Use the denoised Beauty as the base, keep the raw Beauty available.
• Blend: Crossfade denoised over raw (50–100%) to taste; retain crisp details where needed with masks.
• Use Cryptomatte (non-denoised) for precise isolations; grade denoised lighting passes selectively.

Common pitfalls

• Over-strong denoising can wash fine detail; prefer Mild/Medium and blend in comp.
• Don’t rely on denoise to fix extreme under-sampling—solve primary noise sources first.
• Avoid denoising utility passes; it complicates depth, motion blur, and matte extractions.

For upgrades, add-ons, and expert advice on V-Ray, visit NOVEDGE. Their team can help you tailor denoiser workflows to your pipeline.