VRML - vrml terrain property

Author

vrml terrain property

michele giordano

2005-05-13, 7:26 am

a terrain i have meshes-created in 3dstudiomax5 and exported as vrml is
no good to walk on.
for me the reason is that a mesh have not mass property, so is not a
volume then vrml engine don't understand it must be terrain and when i
try to walk, camera go to 0.00.

how i solve this?

fabricator

2005-05-14, 7:47 am

There are two basic causes of this problem.

1) the mesh has holes in it and you fall through them, sometimes caused
by verticies which haven't been welded together.

2) the Viewpoint is too low to the ground. It should be 1.65-1.75
meters above the ground.

Oh and you should also set the System Units max is using the meters

michele giordano

2005-05-15, 7:26 am

so if a big mesh have a dimension of 2x2 vrml engine doesn't understand
that is a terrain cause mesh webbing is not too much dense?

michele giordano

2005-05-15, 7:26 am

meshes are simple surfaces with no slope so there aren't holes in.
viewpiont is an infoviev command so it have parameters like height
relative to terrain, etc...
so i must increase mesh webbing with a value that permit to infoview to
collide with it, but wich is the dimension of "virtual foots"?

Joerg Scheurich aka MUFTI

2005-05-17, 7:32 pm

> meshes are simple surfaces with no slope so there aren't holes in.

According to this definition, the VRML IndexedFaceSets are not meshes.
IndexedFaceSets are simply collections of polygons and it requires
extra inspection of the coordIndex field, if you want to know in general,
if the polygons are connected to each other or not.

For example, the following "mesh"

+-+-+
| | |
+-+-+

can be constructed as IndexedFaceSet with the vertices 1 2 3 4 5 6

1-2-5
| | |
4-3-6

(coordIndex 1 2 3 4 -1 2 5 6 3 -1)

or can be constructed as IndexedFaceSet with the vertices 1 2 3 4 5 6 7 8

1-2/5-6
| | |
4-3/8-7

(coordIndex 1 2 3 4 -1 5 6 7 8 -1)

so long
MUFTI
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michele giordano

2005-05-17, 11:32 pm

so if a big mesh have a dimension of 2x2 vrml engine doesn't understand
that is a terrain cause mesh webbing is not too much dense?

michele giordano

2005-05-17, 11:32 pm