Moving objects in VB.net

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Permalink Reply by David Rutten on November 23, 2009 at 2:45am

Hi Axiom,

we actually have a separate forum especially for VB and C# questions, you may consider posting there to avoid confusion.

Moving objects in the Rhino SDK often works in 2 ways:

1) Some object carry a Translate() function, which takes a motion vector. If your points define a motion from world origin to the point, it seems that all you have to do is:

myBrep.Translate(New On3dVector(pt.x, pt.y, pt.z))

2) Generic transformations are achieved via the Transform() function, which takes an OnXForm instance. OnXForm is a class that represents any combination of translation, rotation, scaling, shearing and tapering. In this case, you'd need something like:

Dim x_move As New OnXForm()
x_move.Translation(pt.x, pt.y, pt.z)
myBrep.Transform(x_move)


--
David Rutten
david@mcneel.com
Poprad, Slovakia

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Permalink Reply by Axiom on November 24, 2009 at 6:34am

Hi David,

Thanks so much for your help, it worked perfectly. I didn't realise that the points needed to be a motion vector.

Thanks again.

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Permalink Reply by leon on July 9, 2010 at 4:11am

Hi David,

Im looking to do the exact same thing although without having any experience in vb.net i would like to achieve this in grasshopper.

I.e

I have a number of breps/surfaces which i am inputting into grasshopper. I want to take their center point and populate them across a uniform grid of points. Like Axiom the first brep would be positioned on the first point, the second brep on the 2nd etc. etc.

If you have any idea it would be greatly appreciated!!

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Permalink Reply by tib ctrl on September 20, 2010 at 4:19am

Hi,
I'm also interested in leon's problem.
how to position breps center points on a given point list or grid
is there a component we can feed with center points on one inlet, and with 3d shapes in an other inlet.
Thanks for any clue.

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Permalink Reply by tib ctrl on September 21, 2010 at 7:48pm

is the vb component the only solution to achieve this?
thanks for your precious help..

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Permalink Reply by leon on September 22, 2010 at 4:57am

Something like this should do it:

1. Graft a list of input breps
2. Find the area centroid of each object
3. Construct vectors from the centroid points to origin (0,0,0)
4. Move all breps to origin on these vectors
5. Make x vectors of different lengths using a series component
6. Array the brep objects using a grafted list of vectors

this will array them breps in a line. To array them into a grid repeat 5 with a y vector and apply this to subsets of the brep list and combine the x and y vectors with a mass addition component

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