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Simple cube...with movable nodes

rgarand
Newcomer
Hello everyone,

I have a simple question to ask and I hope I get a answer like "The GDL object in in the Special Edition Library" or something like that.

I am looking for a simple cube, which I know is in the Basic Shapes part of the ArchiCAD library...but I would like to move each corner node of the cube independently. This is a very typical thing that can be done in the 3D studio's and Cinema 4D programs, but in CAD programs it seems a bit more complicated. I know straight autocad can not even accomplish this task.

Has anyone developed an object that can do this?

All I want to do is draw a slab and take the bottom nodes of this slab, slide them in the x/y direction to make a trapazoid type object and move on...I know I can make it in profiler and the GDL tools plugin...but why can't I do this with the slab object.

Any thoughts?
Robert J. Garand
Dale Gardon Design
ArchiCAD USA 21-Build 4022 USA FULL
Windows 7 Prof (64 bit)
Intel i7-5820K CPU 3.30 GHz (32 GB RAM)
NVIDIA Quadro K4200 (4GB RAM)
13 REPLIES 13

Jay Garbarino
Newcomer
Thought of making the Slab From a Very flat roof and adjusting the "Roof edge angle". I have not tried this and I do not know how "flat" you can make a roof.
Jay A. Garbarino - Cornerstone Engineering
Windows 10 Pro
Dell XPS 8930 - 3.20GHz Intel Core i7-8700- 32GB RAM - 6GB NVIDIA GeForce GTX 1060
Dual Monitors
AC23 USA Full

Djordje
Booster
Jay wrote:
Thought of making the Slab From a Very flat roof and adjusting the "Roof edge angle". I have not tried this and I do not know how "flat" you can make a roof.
This is the way for trapezoidal shapes. Roof can be flat (angle zero)
Djordje

ArchiCAD since 4.55 ... 1995

F_ Beister
Newcomer
It is in so far a bit complicated, because you can't move hotspots in 3 directions at the same point. You have to use 2 for each corner. makes 16 for a cube, if it should be free editable. Many points around in 3D.

But if you can live with this, here comes the next: If you change one point others have to change simultaniously too, because every 4 have to be complanar. Otherwise the surfaces are not planar and split into 2 triangulars, from which you don't know, how they are generated (points 1/2/3+3/4/1 or 1/2/4+2/3/4).

Not easy to make the parameters changing by dragging another (special theme ), but much more complicated is the calculation in the 3D.

One editing solution would be to define the "cube" by 6 moveable points on the 6 surfaces and 12 angles to define their inclination. This is in deed a lot of math, if you need hotspots at the edges. Without, it's not so much, because you can use simple CUTPLANES.

rgarand
Newcomer
F.

Thanks for the explaination...not really what I wanted to hear, but a great techincal explaination. I often wondered if moving points in 3D made the object (faces) more complex. Sounds like it does...
Robert J. Garand
Dale Gardon Design
ArchiCAD USA 21-Build 4022 USA FULL
Windows 7 Prof (64 bit)
Intel i7-5820K CPU 3.30 GHz (32 GB RAM)
NVIDIA Quadro K4200 (4GB RAM)

F_ Beister
Newcomer
One I have for you: Trigon

No cube, just a triangle, but you can combine them. Identical positioned hotspots in space of joining triangles can be dragged simoultaneous, if all are selected.

rgarand wrote:
I am looking for a simple cube, which I know is in the Basic Shapes part of the ArchiCAD library...but I would like to move each corner node of the cube independently. This is a very typical thing that can be done in the 3D studio's and Cinema 4D programs, but in CAD programs it seems a bit more complicated. I know straight autocad can not even accomplish this task.
do you mean something like this? wrote it tonight after reading your post. If its not here, then i am getting the attachment technique wrong.

F_ Beister
Newcomer
That's tricky David, but the "cube" has no plain surfaces. And you can't control the way the surfaces are arched.

BTW: As you use 2 points for the three parameters of each corner: The manual fails in the point one could change more than two parameters with one hotspot. Right?

F. wrote:
That's tricky David, but the "cube" has no plain surfaces. And you can't control the way the surfaces are arched.
BTW: As you use 2 points for the three parameters of each corner: The manual fails in the point one could change more than two parameters with one hotspot. Right?
If you have a fully deformable cube, you are going to get curved surfaces. If you select the ROUGH option, you see the planes in the faces of the cube.

I am not sure why you say each point has only 2 parameters. Its obvious when looking at it in 3D that it has X, Y and Z hotspots.
If one UNHIDES the X,Y,Z parameters, someone could write in specific dimensions.
===davidnc

F_ Beister
Newcomer
I am not sure why you say each point has only 2 parameters. Its obvious when looking at it in 3D that it has X, Y and Z hotspots.
My question was not clear enough:
The GDL manual says, you may assign to one position in space three groups of hotspot-commands, which create one graphical hotspot, which changes, if dragged, and that's my point, three parameters. In my experience, that's impossible. In your object you use one movebale hotspots for X/Y and one additional for the Z-coordinate. I see this as affirmation for the fault of the manual.

This was no criticism in your cube-object. I understood rgarands ask for a "cube", that he needs something like a polyhedron with 6 surfaces. The rough shaped flexcube is yet quiet similar to this.

F. wrote:
This was no criticism in your cube-object. I understood rgarands ask for a "cube", that he needs something like a polyhedron with 6 surfaces. The rough shaped flexcube is yet quiet similar to this.
One could do an object where the faces simply pull in any direction, keeping all the faces planar, but this can be done in Archicad without any GDL. (unless it was capable of skewing, which would be interesting.... one could do an object that used XForm to work. the object i uploaded uses COONS, 6 of them to form a deformed cuboid.

TomWaltz
Newcomer
Brilliant, yet twisted, at the same time! I love it!
Tom Waltz

Karl Ottenstein
Moderator
Brilliant, David!

Karl
One of the forum moderators   •   AC 25 USA and earlier   •   MacOS 11.6, iMac Pro

rgarand
Newcomer
David,

Thanks! This definately does the job I was looking for.

ArchiCAD Talk is great!
Robert J. Garand
Dale Gardon Design
ArchiCAD USA 21-Build 4022 USA FULL
Windows 7 Prof (64 bit)
Intel i7-5820K CPU 3.30 GHz (32 GB RAM)
NVIDIA Quadro K4200 (4GB RAM)

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