outliner · inspector
The review conversation
Pick prims under any renderer, isolate, switch variant sets live, transform with axis constraints. Maya, Houdini and trackpad navigation.
mpt set_v003.usd
3d · usd viewer
3D review, properly.
Not a "preview a mesh" afterthought. OpenUSD on Hydra Storm and two ray tracers sharing one set of controls — on the same transport bar as your footage.
- /Worldxform
- Setxform
- Geo_Amesh
- Geo_Bmesh
- Prop_Cvariant: v2
- Looksmtlx
- DomeLighthdri
- Cam_50mmf/2.8
diorama_v001.spzhydra storm
renderer
realtime · rasteriser · default
Hydra Storm, off the GUI thread.
The realtime path every GPU gets. Huge stages open immediately and stream in; proxy draw modes and a render-thread park during drags keep it interactive.
- progressive, cancellable payload streaming
- EWA splats (experimental), depth-tested with geometry
- look-dev views identical across all three renderers
- windows
- Hydra Storm (HgiGL), off-thread, flip present
- macos
- Hydra Storm (HgiMetal)
- linux
- Hydra Storm (HgiGL)
Works on any GPU, including AMD and Intel.
cpu ray tracer · embree + oidn
The portable second opinion.
Every platform, every GPU vendor — and the reference the GPU tracer is tested against. AO or AO + HDRI with an HDRI-derived sun, stratified sampling, firefly clamping, real-lens depth of field.
- separate while-orbiting quality and a frame budget in ms
- path-traced volumes with multiple scattering
- splats (experimental) ray traced natively, GGX against the dome
- windows
- Embree + OIDN (CPU or CUDA)
- macos
- Embree + OIDN (CPU)
- linux
- Embree + OIDN (CPU or CUDA)
Tumbling stays interactive; the image cleans up when you stop.
gpu ray tracer · built in
Look-dev quality at interactive speed.
hdRt is MPT’s own Hydra render delegate — one core, two device backends sharing the shading maths file for file. Meshes, instancing, VDB volumes and Gaussian splats (experimental) trace in one scene, shadowing each other.
- HDRI dome with importance sampling + MIS
- volumetric path tracer · delta + ratio tracking
- zero-copy into the viewport, off the GUI thread
- windows
- hdRt on OptiX (NVIDIA RTX)
- macos
- hdRt on Metal RT — all Apple silicon; hardware RT on M3 and later
- linux
- hdRt on OptiX (NVIDIA RTX)
Ships nothing extra: CUDA and OptiX come with the driver; Metal compiles at runtime. Without an eligible GPU you get one fewer renderer.
hdRt, measured
hdRt · meshes
0.32
ms / sample, settled
Kitchen_set · 1,788 prims · 537k triangles · HDRI. 0.9 ms per frame orbiting, zero-copy.
hdRt · splats (experimental)
14–16
ms / frame, interactive
471k-splat capture. 37 ms per sample settled at ~530×520.
hdRt · volumes
4.2
ms / sample
wdas_cloud (eighth) · OpenVDB.
// measured · linux · rtx 3090 · headless
Conditions differ per row. Several times faster than the CPU tracer at look-dev quality — not measured like for like, so there's no single multiplier to quote. No Mac speed figure.
explosion_v002.vdb
mpt vdb --lookdev
exampleVolumes with a real look-dev panel.
Path traced under Embree for a preview and under hdRt as the physically based one — real multiple scattering, on the GPU. .vdb sequences stream; volumes inside Houdini .bgeo read directly.
Velocity streamlines through a vector grid, coloured by speed (opt-in, experimental).
camera
A real lens
Focal length in mm, film-back presets, gate fit. Depth of field with f-stop and Focus on Selection, rendered by both tracers.
animation
Reviews like a clip
USD node and skeletal animation, skinned FBX, BVH mocap, animated splat sequences (experimental) — on the shared transport.
turntables
Loop-perfect 360°
Orbit at wall-clock rate whether a frame takes 4 ms or 400 ms. MP4, ProRes or PNG from exact AOV pixels.
ls ~/scenes
- .usd .usda .usdc .usdz
- .abc
- .fbx
- .obj
- .dae
- .3ds
- .lwo
- .blend
- .gltf .glb
- .ply .stl
- .bgeo .bgeo.sc
- .vdb
- .bvh
- .mtlx
- .splat · 3DGS .ply · splats in .bgeo / USD (experimental)
materials: UsdPreviewSurface · MaterialX · UDIM · Ptex (experimental)