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On 27.07.2017 05:39, clipka wrote:
> The mesh files provided by NASA are certainly just the surface, and
> since it's not the entire planet but just a tile (or so I guess),
> turning it into a solid 3D volume isn't trivial. You'll need to proceed
> as follows:
>
> (1) Generate the mesh INC file.
>
> At this point, all you have is a mesh patch object, i.e. a genuinely
> non-solid sheet.
>
> (2) To the mesh, add an `inside_vector` specifying whatever direction is
> supposed to be "up" with respect to the tile.
>
> At this point, you have a chimera between a solid and a patch: It now
> has a well-defined inside (namely every point that is "below" the tile,
> i.e. the tile extruded "downwards" toward infinity). The surface
> definition is still patchy though (pun intended), so right now you won't
> see any effect, because POV-Ray can only render surfaces, not volumes.
>
> Note however that this chimera is already good enough to start "digging"
> using CSG.
>
> (3) Intersect the mesh with another object, e.g. a box, defining the
> dimensions of the "massive block" you want.
>
> Make sure that for any point on the box that is supposed to be "below"
> the landscape, if you trace a line in the direction given by the
> `inside_vector`, it should properly intersect the mesh (note that
> grazing it might not be enough).
>
> This step will add surfaces to the "sides" and the "bottom" of your
> block of landscape, so that they can be seen as well. If that's not a
> thing you need, this third step is entirely optional.
>
Hi Clipka,
I am trying to follow up now your advise. I opened Blender 2.78, and
imported the STL file (MarsVallesMarineris2). But I never worked with
Blender before. Where can I find the option to add an "inside_vector",
and specify its direction?
Might be, I have to ask you a few more things afterwards. But only 1x,
soon i will be able to do it by myself. Hope you don't mind.
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