[Closed] How do you find the size of an object?

Mar 22, 2005 11:07 am

Hi All

Is there a way to find the size of an objects bounding box in Max script?

I need to find the size of the box in local space rather than world space (I.e. the box is aligned to the axis of the object.)

I hoping theres a simple solution to this. Ive had a look around, but I cant find the answer. :hmm:

Thanks

5 Replies

Vormav1

Mar 22, 2005 11:07 am

EDIT: Bleh, read your post wrong. I need sleep… :banghead:

cgrant3d

Mar 22, 2005 11:07 am

EDIT: I should have tried first… My recommendation is in world space…

I think what you’re looking for is the .max and .min properties… Those give you the bounding box corners thus “size = a.max – a.min” will give you a point3 with the object’s bounding box dimensions…

Kenzor

Mar 22, 2005 11:07 am

Thanks

I guess I could create a temporary clone, rotate it so its aligned in world space. then use the ‘max’ and ‘min’ to find the size before deleting it. :shrug:

prettyPixel

Mar 22, 2005 11:07 am

I believe that a beter solution is to rotate your object, not make a clone
but in fact you can retrieve the local coordinates of a vertex using ‘coordsys local’ command context.
If you create your own fonction to calculate the bouding box so you will not have to move the object.
I have already write this function for the UVW coordinates… I search …I search…

… and with a little modification:

fn getSize obj =
	(
	objNumVerts=obj.numVerts
	if objNumVerts>0 then
		(
		coord=coordsys local meshOp.getVert obj 1
		minU=coord.x; minV=coord.y; minW=coord.z; maxU=coord.x; maxV=coord.y; maxW=coord.z
		for v=2 to objNumVerts do
			(
			coord=coordsys local meshOp.getVert obj v
			if coord.x<minU then minU=coord.x
			if coord.y<minV then minV=coord.y
			if coord.z<minW then minW=coord.z
			if coord.x>maxU then maxU=coord.x
			if coord.y>maxV then maxV=coord.y
			if coord.z>maxW then maxW=coord.z
			)--for
		-- min,max,size,center
		#([minU,minV,minW],[maxU,maxV,maxW],[maxU-minU,maxV-minV,maxW-minW],[(minU+((maxU-minU)/2.0)),(minV+((maxV-minV)/2.0)),(minW+((maxW-minW)/2.0))])
		)
	else false	
	)--fn

obj=selection[1]
format "coordsys LOCAL : getsize obj=%
" (getsize obj)
format "world pos : %
" obj.pos

the array return 4 values: min, max, SIZE, center
sorry it’s only for a MESH ! not for a primitive… but you can translate this for mesh by unsing a temporary edit mesh to read the positions.
offcourse it’s beter to change minU –> minX …
and you can use an another axis than the local axis. See ‘coordsys’ in the helpfile for more details about this.