Set unit/solid body exect weight in kg/lbs

Rhino Rhino for Windows
1

I tried to find anything about it but unsuccessful.

Can I set up in Rhino somehow exact weight for the solid?
Say, I have a cube with weight 10kg and another body rectangular shape with weight 20kg.
As an illustration - the cargo deck with different items but known weights for each one.

note: the density of the solids is dissimilar but the weight is known.

2

Is it possible for the specific gravity of the element to be set as a parameter/property of the object/layer and then used in calculation later?

Might not be relevant if the solids are consistent size (ie. nothing much unique to calculate)

3

My goal is - to play with locations of solids with different dimensions and different weights to receive the position of center gravity in a determined place.
Of course, I can do it in “manual mode” but rhino can calculate CG by itself for uniform bodies. The trick is to do the same with non-uniform solids.

4

I suppose you could replace all volumes by new volumes based on one common density and then use VolumeCentroid on all new objects.

5

How about to find the density for 20ft container loaded with fridges, bicycles and timber?
The goal is to receive CG in Rhino without any hand calcs. Grasshopper mb?

6

Hello - I have an ancient script which works off of Rhino materials - the materials need to have a density assigned and then the script finds the correct density from that:

image
image.png324Ă—700 32.3 KB

This is all very crude - you need to specify material density in the material notes in the form

Density= XX gm/cm^3

in any of these units:

“gm/cm^3”, “kg/m^3”, “lb/ft^3”, “lb/in^3”

If you want to try - MassCentroid_Mat.rvb (13.3 KB)

Save, then drag and drop that rvb file onto Rhino, then use the alias

`MassCentroid’

Good luck!

-Pascal

1 Like
7

Thank for sharing but it’s not what I am looking for.
I am NOT INTERESTED to know the density cause I ALREADY KNOW the weight of the object.
I want to set up already known the weight for a concrete object without playing with real or “virtual” density in case of non-uniform object.
Say this solid body 1.5mx20mx1.8m weight is 100kg. Point. Another one body 0.5m x 1m x2m is 2000kg. No volume calcs, no density calcs, just: this solid - X kg. Independently from dimensions.