Learn Tuduni Laboratory.

Open Tuduni Laboratory and choose a Scenario preset. Earth & Moon is a useful first scene: two bodies, a clear orbit and a manageable set of controls. The Sun, binary stars, black holes and galaxy presets answer different kinds of questions.

Universe

Choose a preset, search the object list and select a body. On a narrow screen, use the Universe button to open this drawer.

Inspector

Inspect the selected body and open the display, fabric, physics and other settings groups. Options change with the preset and selected object.

Pause and Reset whole preset

Pause before experimenting. Reset whole preset restores the original scene and its settings; save any changes you want to keep first.

A preset is a starting experiment, not a promise that every mode uses the same physical model. Start with its defaults before changing advanced settings.

Selecting, looking around and moving a body are separate actions. For a small Moon or distant planet, use Search objects or click its name in the object list instead of trying to hit the sphere.

Desktop camera

Left-drag empty space to orbit. Middle-drag, or hold Space while left-dragging, to pan. Use the wheel to zoom.

Phone or tablet

In Camera mode, use one finger to orbit, pinch to zoom and two fingers to pan. Open Universe and Inspector with their visible buttons.

Move a body

Drag its body or name when object movement is intended. On mobile, switch to Move mode first. Pause before placing it so motion does not obscure the result.

Focus, Follow and Reset camera

Focus frames a selection; Follow keeps the camera with it as it moves. Turn Follow off to navigate independently. Use Reset camera to recover a useful overview.

Moving the camera changes your view. Dragging a body changes the scene's physical position. If you accidentally move a body, restore your saved scene or reset the preset.

Simulation time is the time experienced by the experiment. Playback speed says how quickly that clock advances relative to your real time. Video time is the length of the clip you are previewing or recording, in seconds.

Pause, Resume and Single step

Freeze the simulation to inspect or edit. Resume continuous motion, or use Single step to advance a controlled interval while paused.

Playback speed / Simulation speed

Choose a rate suited to the scene. Planetary, lunar and galaxy presets need different timescales; available choices depend on the preset.

Time step and Physics substeps

Time step sets an integration interval. Substeps divide it into smaller numerical steps. Faster playback alone does not make the calculation more accurate.

Step budget per tick

This caps the work performed in each update. A demanding scene may run below the requested speed. Begin with preset values and heed close-encounter or numerical warnings.

Select a body and open Object in the Inspector. Physical values use SI units: mass in kilograms, radius and position in meters, velocity in meters per second, and mean density in kilograms per cubic meter. Scientific notation is accepted.

Dependent property rule

Mass, radius and density are coupled. With Lock density, changing radius changes mass, and changing mass changes radius. With Lock mass, changing radius changes density instead. Read the rule before editing.

Position X / Y / Z

These are coordinates in the scene. Moving an object changes its initial placement; changing the camera does not change these values.

Velocity X / Y / Z

These are velocity components, not a single speed slider. The direction matters as much as the magnitude when creating an orbit.

Massless test particle and Artificially fixed

A test particle follows the field without contributing ordinary mutual gravity. Artificially fixed constrains a body instead of allowing a free response. These are deliberate changes to the experiment.

Physical radius affects the model and collisions. Display radius multiplier only enlarges the rendered body. Do not increase a planet's mass just to make it easier to see.

A useful experiment changes one physical condition while keeping the starting state, numerical settings and comparison time the same. The film compares the ordinary Earth–Moon orbit with a run in which the Gravity multiplier is zero.

1. Choose Earth & Moon, reset the preset and pause. Keep the measured masses, radii and starting velocities unchanged. Save or export this starting scene.
2. Use Gravity multiplier 1 for the baseline. Run to a chosen simulation time and note the clock, separation and path. Pause and keep a screenshot or recording for comparison.
3. Restore the same starting scene. Change only Gravity multiplier to 0, then run to the same simulation time with the same Time step and Physics substeps.
4. Compare from compatible camera views. Without mutual gravity, bodies retain their initial velocities and the Moon no longer follows the same curved orbit. Restore the baseline when finished.

The filmed comparison uses exactly seven simulated days. For a strict repeat, use the downloadable baseline below: Time step 3,600 s and 32 substeps. At that step size, 168 single steps reach 604,800 s. Match simulation time, not just the number of real seconds you wait.

Pause and choose a New body preset, then Add body. The new body is selected so you can name it and set its physical properties before exploring the result. Add one manageable body at a time.

Placement and movement handles

Drag the body or its name, using the movement plane or axis handles for the intended direction. Inspect its numerical position when precision matters.

Drag release action

Check the release behavior before moving a body. A mode that changes velocity produces a different experiment from one that only repositions it.

Initial velocity

A nearby object does not automatically become a satellite. Its starting position, velocity and the other masses determine the resulting trajectory.

Duplicate, Delete body and Clear universe

Duplicate makes a starting point for another body. Delete removes a selection. Clear universe removes the scene's bodies; keep a saved baseline before clearing or resetting.

Body-count limits depend on your account. Do not use many objects to troubleshoot an orbit: first make a small scene easy to understand.

Choose a Surface skin, Body color or Material for the selected object. Axial rotation speed and Axial tilt control its spin presentation; Keep one face toward parent (tidal lock) is useful for a Moon-like orientation. These controls are separate from orbital velocity.

Use real sizes and distances

Switch between the preset's readable presentation and its real-scale option where available. A planet can become extremely small in a true-scale wide view.

Display radius multiplier / Earth-size visibility radius

Enlarge the appearance of a small body without changing its physical radius, mass or collision size. Coordinate scale is also a display mapping.

Show object names and Show object paths

Toggle labels and orbital trails to explain an orbit or simplify a cinematic shot. Object visibility, satellites and the asteroid belt have separate controls where supported.

Velocity arrows and Acceleration arrows

Use direction arrows to compare current motion with its change. Turning arrows off hides a visualization; it does not turn off the force.

Fabric starts hidden. Open Fabric, choose a mode and enable it. 3D Grid, Small Dots, Directional Dashes and Transparent Plasma offer different ways to read the field. Try them from the same camera view before deciding which tells your story best.

Fabric density, color and opacity

Density adds samples; opacity and color control visibility. Adjust dot size, dash length, grid stroke width or plasma brightness to suit the selected mode.

Visual pull intensity and displacement

These strengthen the visible deformation. Maximum visual displacement limits the drawn response; it does not change the body's gravitational mass.

Visual Falloff and field thresholds

Minimum Visible Field Strength and Full Visual Strength change how the field is mapped to the display. Show Visual Influence Boundary reveals that mapping's range, not a hard edge where gravity stops.

Detail, sampling and performance

Field sampling detail, Fabric sample budget, spatial extent and update frequency affect rendering cost. Rendering quality and Automatic optimization help balance detail and responsiveness. Reset Fabric Settings restores a useful starting point.

Fabric is an illustrative representation of the field, not a literal material surface or a fluid simulation. Changing its appearance does not itself change the orbit.

The ordinary material-body experiments use a Newtonian N-body model. Smaller integration steps matter near close encounters. Keep settings consistent when comparing runs and use diagnostics to investigate a numerical problem instead of judging accuracy from a smooth picture alone.

Gravity multiplier

Change the modeled gravitational strength deliberately. Keep it at the baseline value when testing a different condition, such as initial velocity.

Nonphysical softening

Softening modifies the short-range interaction to avoid a singular numerical force. It changes the modeled encounter; it is not just a drawing option.

Global collision mode / Body collision behavior

Select the intended collision treatment. Restitution affects bounce behavior where applicable. Merging, constraints and other interactions can change which conservation comparisons are meaningful.

Data and diagnostics

Inspect relative energy drift, kinetic/potential/total energy, momentum, angular momentum and center of mass. Frame time and active field samples describe performance. Read diagnostics in the context of the active model and constraints.

First make the experiment clear; then create a cinematic version of the same scene. Choose Space background, visibility, Background brightness and Sky rotation to find a useful environment without altering the physical initial conditions.

Stellar glow

Select a star, then open its glow controls in the Inspector. Show stellar glow, Glow opacity, Glow range, Glow softness and Glow brightness shape the light around it.

Glow range

This controls how far the rendered halo extends. It is a presentation setting, not an increase to the star's gravitational influence.

Camera and contrast

Try a wider framing, another elevation and a quieter background. Hide unnecessary names, trails or overlays when they obscure the result. Keep scientific comparisons matched.

Specialist visualizations have their own models and controls. Use a magnetic-dipole or neutron-star scene to explore magnetic traces, and a lensing scene to compare light paths. A field drawing and a force on a body are different choices.

Show magnetic fields / Apply magnetic forces to motion

Display the field, then independently choose whether the implemented magnetic force affects motion. Opacity and tracing range change its appearance. Intrinsic magnetic dipole, polar field and orientation describe the magnetic setup.

Magnetic model limits

The field uses a dipole approximation with superposition. It does not solve a full plasma, stellar-interior or magnetohydrodynamic model. Polar radiation beams are a separate illustrative display.

Light emitters and weak fields

Choose a Light solver and Add light emitter. Set its origin, direction, ray count, fan spread, tracing length and steps. Compare bending with a straight reference. Ray deviation display magnification exaggerates a subtle effect for visibility.

Black Hole — Schwarzschild

This mode traces light for a stationary, isolated, nonrotating black hole. Horizon, photon-sphere and sample-path overlays explain different features. The accretion disk, colors, brightness and optional moving light are illustrative; they are not a fluid calculation or light escaping from inside the horizon.

In the black-hole scene, Lensing quality and Lensing resolution affect the image. Frame black hole at horizon scale helps recover the intended close view. This optical model does not make every other preset a full relativistic simulation.

Real Planet Positions is an observation mode: its sourced positions and time controls are different from a freely edited gravity experiment. Conflicting editing options can be restricted. Milky Way and Known Universe scenes also offer schematic display choices alongside real-distance options.

Galaxy views

Explore destination, detail, star density, dust lanes, nebulae and the stellar halo where available. Read the real-distance and accelerated-motion labels before interpreting sizes or apparent speed.

Related Tuduni tools

The Solar System Explorer, Satellite Explorer, Sky Observatory and Live Moon have their own catalog/observer workflows. Use their data-source notes and time indicators to understand what is calculated.

The film introduces these modes briefly. This guide focuses on Laboratory controls; a galaxy view is not a claim that every illustrated star, cloud or encounter is measured live.

A saved simulator project and a downloaded video are different things. A project lets you return to an editable scene; an MP4 preserves the moving pictures you recorded.

1. For a local scene file, use Export to download scenario JSON. Use Import to reopen that file. Save or export the current scene before replacing it.
2. For an account project, sign in and choose Save Project in the account toolbar. Give the scene a useful name. On mobile, open the Project menu to reach saving controls.
3. Reopen it from your projects and check the objects, visualization, camera and simulation time. Explicit saves create versions; do not assume every animation frame has been saved.
4. Use Save As when you want a separate project. Save again after an intentional edit. Download and retain recorded video files separately from the project.

Choose Export Video in the Laboratory toolbar. The simulation pauses at the current position so you can prepare the shot. This is a live browser recording, so device performance and codec support affect the result.

1. Choose Scene only for the rendered scene, or the supported simulator-area capture option when you want to show controls. Check Object labels and Orbital trails: their starting values follow the scene's display settings.
2. Choose your aspect ratio, resolution, frame rate and duration. MP4 is the default. MOV and WebM availability depends on the browser. Your account determines the available limits; a long tutorial film is not a Free-account export entitlement.
3. Orbit, pan or zoom in the capture view to frame the subjects. Use Enlarge view for a bigger preview. On desktop, the settings sidebar remains available; on mobile, use Show capture settings to reopen it.
4. Use Play preview, Pause preview and Reset preview to rehearse the shot. Video time shows elapsed clip seconds. A camera preset, Motion subject or Follow object can guide the view; Show / edit camera path exposes anchors and Bézier handles for an editable motion.
5. Press Start recording, pause/resume if needed, then Stop recording. You can still adjust the camera, follow a body or move objects while recording. Remember that moving a body also changes the experiment.
6. Download video and play the actual file before leaving. Keep the downloaded file; a preview in the browser is not your backup. If playback stutters, try a shorter clip or lower resolution/frame rate and reduce expensive scene effects.

The duration setting is a capture limit in video seconds, not simulated years or days. Background tabs, thermal limits and interruptions can affect a live recording. Some devices cannot encode every offered format or resolution.

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