Grasshopper beginner

Replies to This Discussion

Permalink Reply by David Rutten on April 10, 2013 at 8:55am

Several ways of doing this. You could maybe start with rectangular boxes and then deform them. Or you could generate a set of rectangular floors and then loft them. Or you could generate the curvy vertical bits and then extrude them.

Grasshopper is a development platform and it can help you automate a process. But you have to know the process first.

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David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Nick Tyrer on April 10, 2013 at 9:20am

Quick question; are you using grasshopper because you want to have parametric version of this building/learn gh. Or do you just need a static 3d model of this building and you have chosen to do it in gh? 

If the answer is the latter, it may be easier for you in rhino;

draw building profile curve > copy it > loft > extrude > mirror (approx: 30secs) 

If you wish to do it in gh, then that same process will roughly work in gh, use the tutorials link at the top of this page...

Permalink Reply by baz koybasi on April 10, 2013 at 9:22am

Honestly, i'm using grasshopper because i have to.  It's a grasshopper class so i need to show how i did it not produce a render.   

That's so much help thankyou

Permalink Reply by Nick Tyrer on April 10, 2013 at 9:26am

haha well for a grasshopper class, i agree, you probably should use gh. Personally i found the http://digitaltoolbox.info/ tutorial videos the most help when i was starting. Try to work your way through all of them, everything might not seem relevant at the time, but its all core stuff you need to know.

Permalink Reply by baz koybasi on April 10, 2013 at 9:34am

Thanks alot.  Even though i'm trying to pass this, i actually do want to learn how to use it properly so they will help me do so.  Thanks

Permalink Reply by David Rutten on April 10, 2013 at 10:13am

Usually step 1 (in any programming environment, not just Grasshopper) is to come up with the algorithm. In this case an example of the algorithm might be:

1. Define a point Pa on the ground.
2. Define a point Pb, x units directly above Pa.
3. Move Pb parallel with the y-axis for z units.
4. Create a Bezier Ba from Pa to Pb, which has vertical tangencies at both end-points.
5. Copy Ba (and name it Bb) and move it along the y-axis for q units.
6. Create line segments La and Lb between the end-points of Ba and Bb.
7. Join Ba, La, Bb and Lb into a single closed, planar curve.
8. Extrude this curve for k units along the x-axis, creating the brep Ka.
9. Cap Ka to create a closed solid Kb which represents one of the 4 building towers.
10. etc. etc.

Some of these steps should be do-able even for a beginner. For others you may require help from teachers or forum members. But without a written (or drawn) algorithm like the one above, this is very much a 'do my homework for me' question and they tend not to get answered.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by baz koybasi on April 11, 2013 at 9:00am

yeh i understnd it sounded a little like that, but i didn't intend it to.

How do get the extrude to extrude along the curves and not just straight up from the base surface?  

Permalink Reply by David Rutten on April 11, 2013 at 9:34am

Hmm, it seems I never wrote an 'extrude along curve' component. You can only extrude along linear vectors or extrude to point. You'll have to use the Sweep1 component, but that will not give the exact same result.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on April 11, 2013 at 11:28am

Added [Extrude Along Curve] component for future needs:

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David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Mateusz Zwierzycki on April 11, 2013 at 11:51am

The new panel icons are really great... much more readable.

Permalink Reply by Michael Pryor on April 11, 2013 at 12:37pm

well that's convenient