splats—

fps—

t—

state—

dpr—

Gausseous

Drop a .ply / .spz / .splat / .sog file here — or tap Choose file — or load the test asset to check the pipeline.

no parameter focused Audio 0.00 Mask Inv Gesture

no camera keyframes

click a parameter name to focus it

Map

—

Booting…

Splat file

Level of detail on next load (large scans)

.ply, .spz, .splat, .ksplat, .sog, .zip or .rad. Or drop the file on the viewport. A new splat clears the transform and camera keys, which belong to the old capture.

Camera move

The pivot is what Orbit turns around and what a mouse-drag orbit is centred on — misaligned pivot is usually why the model and camera feel like they're fighting each other. Picking one does not move the camera; it only changes what future orbiting turns around.

Ease—

Ease is used by keys set to Auto in Ease timing only.

Snap

No camera keyframes — camera stays under manual orbit control. · off curve

Turns—

Phase—

Elevation—

Distance—

Turns is signed — negative reverses direction. Distance is in multiples of scene radius and re-centres on the current framing whenever the view is reframed. Orbit always centres on the current orbit target, not a stored keyframe.

Transform correct

Rotate X—

Rotate Y—

Rotate Z—

Position X—

Position Y—

Position Z—

Scale—

Euler order XYZ. Position is in multiples of scene radius, scale is log-mapped. Locked outside Correct — this cannot be animated, keyframed, or routed to audio, and it is not the same thing as a per-region transform. Rotate X 180° is the default Y-down correction most captures need.

Opacity per-splat cull

Min opacity—

Max splat size—

Size × all—

Opacity × all—

Anisotropy limit—

Size and shape are independent failure modes — a needle can be small in volume and still streak hundreds of pixels — so Anisotropy limit is not a duplicate of Max splat size. It modifies geometry and costs real detail; reach for the Points section's Antialias floor first.

Opacity × all is a peak-alpha multiply applied before Spark's own minimum-alpha discard, so it both dims the model and thins it — but measured on a 44k capture the dimming dominates by a long way: at ×0.25 the brightest pixels are down 93% while the lit area is down only 3%. Expect a fade, with a secondary erosion at the edges. Above 1× is not "more": Spark's fragment shader gives alpha over 1 a different, sharper-topped falloff, so it reads as harder-edged discs. It does not replace Min opacity, which is the only one of these that touches diffuse low-alpha haze.

Masks sdf, 6 slots

Invert

Own dyno SDF per slot — sphere/box/ellipsoid/cylinder/capsule/plane, all evaluated unconditionally so no shape change ever recompiles. Centre and size are in units of scene radius. Shrink softens splat scale toward the edge, replacing the old Reveal effect's shrink-into-edge (a plane region in Cut mode reproduces it). Colorize R/G/B only apply in Colorize mode. Any of Noise / Saturation / Tint / Opacity below can be scoped to one of these four slots via its own Mask control in the lane — independent of what this slot's own Mode is doing.

Background canvas colour

Hue—

Saturation—

Brightness—

Hit hue shift—

Flash strength—

Flash fade (ms)—

Additive lights and an additive mesh glow on dark backgrounds and wash out on light ones; for a white background, set the Mesh to Normal blend and Black.

Points point cloud + mesh

Pulls every splat toward one small, uniform dot, so the capture reads as a point cloud. The splats are still Gaussians, so very small dots thin out and darken the image; raise Opacity × all (Scene tab) or route audio onto it to compensate. Scope it to one mask with the lane's Mask control.

Point cloud—

Point size—

Size jitter—

Antialias floor—

Mesh coarse links between centres

A coarse wire mesh through a thinned-out set of splat centres — keeps the gist of the geometry, not the detail. Built once, then drawn in a single pass, so it costs almost nothing per frame. It sits at the splats' rest positions: Noise and Quantise move the points but not the mesh.

Mesh—

Coarseness—

Links per node—

Max link length—

Reveal—

Width—

Taper—

Dotted—

Dot length—

Dot travel—

Node dots—

Hue—

Intensity—

Depth cue—

Lights three band lights

Three point lights added on top of the capture's own light. Each light can follow an audio band: pick one in its header. Place a light, then click the model; drag the numbered markers on the viewport to move one. Strongest on dark or low-key captures, weak on bright overcast scans; the method adds light but cannot remove what is baked in.

Colour tint + saturation

Brightness—

R—

G—

B—

Saturation—

Depth fade + field

Depth of field lens blur

Spark's own per-splat circle-of-confusion blur — a defocused splat is exactly another (wider, dimmer) Gaussian, so this composites correctly through the existing sort with no special handling. 100 is exactly off, on the fast path, not an invisible blur still paying for itself.

Pick threshold—

Depth of field—

Focus (stops)—

Near blur boost—

Focus is an offset in stops from the pivot, not an absolute distance — the pivot describes what is being looked at, where scene radius describes the whole scan and stops meaning nothing once you have dollied into a detail. Gaussian bokeh only: no aperture shape, no cat's-eye, no shaped highlight discs. Those need a custom splat shader; out of scope here.

Depth fade aerial perspective

Fades opacity and tints toward the current Background colour with distance — dissolves distant splats into the backdrop. No effect at Amount 0.

Amount—

Near—

Far—

Optics lens body

Renderer-level properties, not per-splat modifiers — these apply to every gaussian on every frame whether or not depth of field is on.

Focal surface scheimpflug + curvature

Bends and tips the surface that is in focus. All three do nothing at Depth of field 100, because there is no blur for them to shape.

Field curvature—

Tilt—

Swing—

Swirl tangential defocus

Stretches defocused splats tangentially around the frame centre — the petzval / swirly-bokeh look. Coupled to the amount of defocus, so an in-focus subject stays clean and only the surround swirls. Nothing happens at Depth of field 100.

Swirl—

Swirl falloff—

Film emulsion profile

Profile emulsion

Parametric approximations, hand-tuned rather than measured — named descriptively rather than after real stocks, so nothing here claims an accuracy it does not have. Intensity 0 is an exact bypass, the only honest way to A/B a look.

Intensity—

Halation—

Veiling flare—

Highlight rolloff—

Shadow lift—

Grade print

A grade layered on the profile's values, not a replacement — every control here works with no profile selected, and every control is an exact bypass at its own neutral value.

Exposure—

Temperature—

Tint—

Contrast—

Lift—

Gamma—

Gain—

Saturation—

Frame vignette, crt, rebate

Vignette lens falloff

A fullscreen pass over the finished render, not a per-splat effect — darkens toward the edges in linear light, so it behaves like lost light rather than revealing the background through a translucent cloud. No effect at Amount 0.

Amount—

Radius—

Softness—

CRT scanlines + fringe

Scanlines across the finished frame, with a colour fringe that grows toward the edges. The line count is per frame height, so an export at any resolution matches the preview. No effect at Amount 0.

Amount—

Lines—

Fringe—

Rebate film edge

The physical carrier around the image, applied last — crop, fill, rounded-box edge with a noise-perturbed border. No effect at Border 0 or Aspect "No frame".

Fill—

Border—

Edge irregularity—

Corner radius—

Tilt—

Grain post pass

Simulated film grain in the finished image, sized in output pixels so a setting matches across export resolutions. Re-randomised every frame rather than translated, so it reads as grain rather than a sliding texture. No effect at Amount 0.

Amount—

Size (px)—

Colour—

Noise displacement field

Amount—

Frequency—

Drift speed—

Per-splat scatter—

Displace by colour — offsets along one axis by the splat's own raw luminance or hue, centred so mid-tones don't move.

Colour offset—

Fracture voronoi cells

Cuts the capture into chunks on a grid and moves each chunk as a whole, each in its own direction and phase — the scan shatters rather than melts. Chunks are keyed to the splats' rest positions, so a chunk stays a chunk however far it travels. No effect at Amount 0. Scope it to a mask with the lane's Mask control.

Amount—

Cell size—

Speed—

Quantise voxel snap

Amount—

Cell X—

Cell Y—

Cell Z—

Grid basis — rotates the snap grid before quantising, so it does not have to align with the world axes.

Grid rot X—

Grid rot Y—

Grid rot Z—

Single-axis mode overrides the 3-axis grid above: only that axis snaps, with a per-band random offset — stratification / scanline, not cubic voxels.

Band offset—

Colour posterise—

Wave index-phase sweep

Modulates Noise amount, Quantise amount and each Mask's Attract amount with a per-splat, animated 0..1 envelope — so those effects sweep through the cloud instead of applying uniformly. No effect at Amount 0.

Amount—

Frequency—

Speed—

Smear screen-space streak

Stretches each splat's own projected shape along a fixed screen-space direction — the same covariance-plus-energy-correction machinery Depth of field uses, so the two compose. Screen-space, not per-splat: a uniform streak direction, not each splat's own motion. No effect at Amount 0.

Amount—

Angle—

Audio bands + mappings

no audio loaded

Low

0.00

Mid

0.00

High

0.00

Hit

0.00

Mappings band → parameter

To map: arm a band under Map in the transport bar, then click any slider in the panel. Click it again to unmap; Esc when you are done. Depth is how far the band pushes the control, as a fraction of its whole range; negative pushes it down. Audio adds on top of the slider and any keyframes. Low / Mid / High follow loudness in their band, Hit pulses on each detected onset.

Analysed once, offline, not sampled live, so scrubbing, playback and export all read the same values.

Output webcodecs

Bitrate (Mbps)—

Sort settle (ms)—

Each frame now awaits Spark's own generate+sort completion, so this should stay at 0. It is an extra manual wait kept only as an escape hatch if a capture ever still shows wrong-order blending that the live view doesn't.

Preset json

Saves every parameter, envelope, toggle and camera key — everything except the splat itself, which is referenced by name only. Drop a .json on the viewport to load.

Viewport

Background colour is in the Look tab.

Pixel ratio—

Mobile profile (caps pixel ratio, forces LOD)

Space	play / pause
, .	step one frame back / forward
Shift + , .	jump to previous / next camera keyframe
Alt (⌥) + , .	jump to previous / next audio hit
Home / End	playhead to start / end
[ ]	focus offset down / up, one small step
1 – 6	select region slot
R	reframe
H	hide / show the rail — preview the frame clean
Hold A	Adjust — release to return to the previous mode
Hold F	Focus pick — release to return to the previous mode
Esc	end Map mode, close Length, exit any transient mode, clear a focus lock
?	this overlay

Gausseous

Keyboard