propably easy, i wanna build a model of a 3d mesh in real. so i was thinking to connect pipes with balls,
by already knowing the angle and distance to the connected vertices. so i can put in the index and
have all the measurement available.
i know vertexbuffer a bit, but how do i know wich ones are connected? than i might be ready to do with myself
the Index buffer contains the information of which vertices are connected with each other.
it defines the triangles by a sequence of integer numbers. 3 consecutive numbers represent the vertex indices of one triangle.
hey Tonfilm,
i studied the vertex buffer node a bit, and i can see that each vertext appeares one time in the position XYZ pin. But i cant find these index buffer pin or node. If i would, i just could look for the appearence of the vertex to find all connections.
Another question, i actually use “distance” and “angle”, the angle node gives me 0 when the angle should be about “0,125”. ( image ) or it has some wierd orientation. This could also happened because i use a decompose transform node.
of you want to have the position of a transformation then you need to do ApplyTransform (Vector) or * (3d) to take all transformations of the matrix into account.
I hope i am not making a complete fool myselfe but the angle should be something close to 0.5 (“fully open” and assuming both vectors are on Z=0 but non of them is at 0,0,0) as with 3d vectors the angles usually limit to 0-0.5 and thats also the limit the formula inside the angle module calculates. This results from the angle beeing just a 2d angle between these vectors on their span plane, right?
see this video and especially from 6:30 how a span plane between 3d vectors looks like.
so this angle node might be not a good approach at all if i understand your question right.
hey there,
thanks so far, i will study this quitely.
I still dont know how to find all vertices/triangles connected to a specific vertex.
The vertexbuffer(split) is what i studied, but i cant find a pin with id`s.
cheers
it is the indices pin on the mesh split.
well,
i am quite happy with the progress, here is some visulisation.
Almost there, in the best way i would use longitude and latitude for the angles,
would this be easier in vvvv with having the xyz values of two points?
Also i downloaded a stl file to try, they seem to have each triangle for its own.
So i need to prepare them in meshlab i guess, or having a routine in vvvv that checks for equal xyz vertice positions
and unify those together.
thanks so far
okay,
i tried multiple meshes downloaded from the web.
Often the triangles are not connected.
So i need to find points sharing the same position i guess.
One vertice with xyz values, and a spread with of all vertices
with there xyz values.
if i simply use a “=” node,but i think it compares each value for its own.
So how could i check for a match of 3 following values.
cheers
Just do AND (Spectral) with binsize 3 after =
that worked perfectly. thanks so far.
another problem in this work seems, that each connection between two points
is there at least twice, because a → b and b → a.
seems simple to solve, i tried with the “=” node and could delete some, but its still to much.
would be really happy to get some help.
thx,ronny
lines.v4p (57.9 KB)
Have a look at Occurrence (3d).
woh, thats a huge one.
it helps me a lot on another issue, espaically the “first occurance” pin.
i still struggle to find not only same 3d positions, more to find a specific combination between two points.
so all lines that occure twice.
i am thinking to combine the two positions to its center position, to then have only
one position i can work with. need to try at home…
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