Change the pivot point of my object?

[AppleTea]

I'm very new in this area, so excuse if it's a stupid question.

My problem:

I want to build a prism (polygon consits of 24 planes). So I have 24 planes, everyone of them is 15° degreed of each other and grouped. Because it is to complicated to calculate how much the x and z distance is, it would be easier if you set the pivot point in the bottom right for example? right? but how? or is there another possibility to create a circle which consists of planes?

sorry for my bad english :-/

[mrdoob]

You have two options.

Offset all the vertices in your geometry:

geometry.applyMatrix( new THREE.Matrix4().setTranslation( 0, 10, 0 ) );

Create a object that will act as pivot:

mesh.position.y = 10;

var pivot = new THREE.Object3D();
pivot.add( mesh );

scene.add( pivot );

[nkint]

is there any pros or cons in those two methods?

[placegraphichere]

geometry.applyMatrix( new THREE.Matrix4().setTranslation( 0, 10, 0 ) );

is now

geometry.applyMatrix( new THREE.Matrix4().makeTranslation( 0, 10, 0 ) );

7f05ba1

[JimmyJangkrik]

the applyMatrix makeTranslation thing, doesnt work in my case. dont know why.
the pivot object works. and IMHO it's easier.
note:
use this

mesh.position.x = ###;
mesh.position.y = ###;
mesh.position.z = ###;

instead of:

mesh.position.set(###,###,###);

[Tyguy7]

Thanks @placegraphichere, that helped.

[nylki]

Something like this should work as well with three.js v78, if you wanted to eg. rotate around your objects edge instead if its center:

mesh.geometry.translate( -myObjectWidth/2, 0, 0 );

[mrdoob]

But be aware that using geometry.translate() is going to modify the position of all the vertices. It's a good solution as long as you're not planning on changing the pivot again later.

[imguccho]

I want to translate my mesh (3d box container) origin from center to left bottom corner. So when I will add any other small mesh box inside the container mesh, it should gets placed inside the left bottom corner instead of placing at center.

mesh.geometry.translate( -myObjectWidth/2, 0, 0 );

When I am using this, my mesh position is also getting changed

[mrdoob]

@imguccho please, use the forum for help.