Mars透明石灯

Mars Lithophane Lamp

2024-03-26 03:12:25

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Summary

This is an experimental Mars Lithophane lampshade based on Mars terrain data.

I say experimental, in that the design attempts to portray accurate Martian surface colour (albedo) shading internally via light (print wall thickness), and Martian terrain elevation externally via form.

This sounds nice, but is tricky in execution, as the albedo colour data has to be subtracted from the elevation data and then displaced internally from the terrain surface features, towards the centre of the sphere.

The resulting internal form from those two combined datasets looks like a rather weird and random mess, but effectively creates the correct wall thickness within the print, to softly shade the Marian surface colours through the terrain.

The goal being that when the lamp is off, the plain white exterior looks like a realistic, to-scale Mars terrain elevation model, and then when the lamp's turned on, the back-lighting compliments those terrain contours with accurate albedo shading, achieved via the lamp's back-lighting glowing through the varying density of the white PLA (Lithophane effect).

I think it came out pretty good, although being printed in halves requires glueing along the equator, which results in a thin seamline in the lighting effect.

This was designed for using with my bedside lamp, and has an 88mm hole at the south pole which rest on the lamp base (centering it over the lightbulb for an even lighting effect)

Print Settings

Printer brand:
ELEGOO
Printer:
ELEGOO NEPTUNE 3 Pro
Rafts:
Yes
Supports:
No
Resolution:
0.4mm
Infill:
100%
Filament brand:
Elegoo
Filament color:
White
Filament material:
PLA+
Notes:
This design was done for an FDM printer, sliced in two hemispherical halves, with the equators on the printing plate. Because it's a large, thin walled print - especially at those equators, a good 5mm raft (or brim) is a must to ensure good bonding and stability on the plate, throughout the duration of the print.

It shouldn't need support material as the unique rough internal forms in this model do a good job of underpinning all the following layers as the printer works its way up to the poles of each hemisphere.

Being a lithophane, 100% infill is important for strength and good even opacity effect when back-lit.

This print took 15hours per hemisphere (so ~30hrs in total)

How I Designed This

This design uses two Mars datasets I've downloaded from the Mars Global Data website
https://www.mars.asu.edu/data/
Albedo data (Martian terrain colour as greyscale tonal shaded equirectangular image map)
Mars Albedo
Elevation data (Martian terrain elevation as greyscale height equirectangular image map)
Mars Elevation
These images were combined in the 3D software on two highly tessellated spheres, both spherically UV mapped to correctly position equirectangular images reflecting the real Martian surface map.
On the outer sphere, a displacement modifier with the elevation map is applied, giving the outer surface the realistic terrain height features, and on the inside sphere 2 x isplacement modifiers are applied with the elevation map and the albedo maps subtracted against eachother, giving internal elevation of the albedo relative to the terrain data height.
3D View
The internal form from the inside sphere's two combined datasets looks really weird and random, but is a correct result for the albedo shading as wall thickness within the print.
Print inside
The displacement of these two spheres were slightly tweaked to make sure they nest inside and don't clip eachother (avoiding errors or negative holes when sliced).