Rigid transform
\[\mathbf{p}_{\mathrm{world}}=TRS\,\mathbf{p}_{\mathrm{local}}\]
Every component is positioned by translation T, rotation R, and scale S. This gives a reproducible mathematical scene graph instead of freehand drawing.
Regolith handling
Excavator buckets and scoops
Scoops, buckets, and blades are the basic contact tools for granular materials on the Moon, Mars, and asteroids.
Engineering notes
What matters technically
- Cutting edge geometry must account for cohesion, grain shape, electrostatic dust, and abrasive wear.
- On airless bodies, there is no atmosphere to help cool motors or suppress dust.
- Tool forces, chassis mass, and anchoring strategy must be designed together.
Study visual
Local technical rendering
This page uses a bundled study image so the presentation stays same-origin and stable.
The image above is paired with the engineering notes on this page and does not depend on remote media pages.
Mathematical model
Engineering geometry model
Engineering models are procedural, dimensionally organized teaching models. They use geometric primitives, known subsystem layout, symmetry, and transformation matrices; they are not generated from a visual image and are not exact manufacturing CAD.
Symmetry and repetition
\[\mathbf{p}_k=R_z\!\left(\frac{2\pi k}{N}\right)\mathbf{p}_0\]
Repeated structures such as solar panels, trusses, engines, wheels, and array segments are generated by rotational or translational symmetry.
Scale verification
\[\mathrm{ratio}_{\mathrm{scene}}=\frac{\mathrm{dimension}_a}{\mathrm{dimension}_b}\]
Where the page presents relative component sizes, the scene preserves those ratios or states when readability scaling is applied.
Verification standard: the rendered object must be reproducible from stated equations, catalog parameters, or explicit geometric transforms. Visual reference images may inform presentation only; they are not the source of orbital positions, field vectors, accretion-disk gradients, timing, or engineering layout.
Limitations: browser scenes may use bounded scale, compressed distances, simplified two-body dynamics, schematic transfer curves, or educational approximations where full numerical ephemerides, CFD, finite-element models, or general-relativistic ray tracing are outside the page scope. Those simplifications are part of the model contract, not hidden image-based construction.