MXS How to get area of an object

Coding
#1

Hey guys,

I was wondering how to get the area of an object. The obj.min obj.max will get us the bounding box size of the obj but not exact area. For eg:
if we have to get the actual volume of the sphere (diameter), how to go about it??

Thanks in advance

#2

can i go about it like calculating the distance from the pivot to ( obj.max.x or .y or .z )^3pi(4/3) like in actual math or is there any inbuilt fn for it???

#3

You can sum the face areas, check this snippet from Marco Brunneta:

FOR faceIndex = 1 to numFaces DO
(
objectArea = objectArea + (meshop.getFaceArea o.mesh faceIndex) --get the object’s full area by adding the faces
)

Taken from here: http://forums.cgsociety.org/showpost.php?p=5463676&postcount=7

#4

Thanks alot Kameleon :slight_smile:

#5

I have actually tried it before but it was not serving my purpose here. What I want to do is to fill up any selected objects with the number of cubes, the cubes not going out the the object.

#6

Well, if you’re just trying to get that done instead of “how to do it” you have this: http://www.erensaritas.net/voxelator.html and you can probably do the same with pflow.

If you need the “how to” a quick search led me to this: https://code.google.com/p/block-creator/ but I haven’t tried it or tested.

#7

IGNORE

Why can’t we delete posts?

#8

Theodox, dint get it. IGNORE??

#9

I started by posting a link to the marching cubes algorithm but then I re-read the OP and realized it was the inverse of what you really wanted (it’s for skinning a voxel cloud instead of turning a skinned mesh into voxels, which was basically what the original post was asking for).

When I realized the link was useless I went to delete it - but too late, vbulletin doesn’t believe in deleting (or at least I don’t know how)

This, OTOH, might be the approach you want:
http://blog.wolfire.com/2009/11/Triangle-mesh-voxelization

#10

That link was cool Theodox. Thanks. :slight_smile:

#11

Hey, dunno if this is what you wanted originally but I started to work on my own thing, this is a very good challenge! http://www.youcandoitvfx.com/voxel-grid-creator/

#12

WOW…thats exactly what I was describing it like… fantastic work Kameleon. I was held up with other stuff and got some time to work on this. Have done the basic stuff with vol.select. need to create it like a proper tool like u did. :slight_smile:

#13

And doing it thru vol.select modifier is faster than ray tracing i believe. think you have also used vol.select.

#14

[QUOTE=Theodox;23512]IGNORE

Why can’t we delete posts?[/QUOTE]

Whoops, you can now :slight_smile:

#15

No, I’m not using volume select, although I’ll have a look into it and check if the results are better (meaning, faster)!

Edit: Gave it a quick try… but seems very very slow!

#16

Oh yeah. It’s too slow. Can you give me a tip of how to go about it ? can you share the script if possible? It wud be a great help for me to learn

#17

Well, I’m thinking about going commercial with this script, but you can definitely use the one I posted before (I’ve been using it to compare times with mine) https://code.google.com/p/block-creator/

If that’s what you’re looking for, I think you don’t need to look further, it works well and it’s a great foundation for you to learn.

#18

Oh… thats gr8. Hope you make good amount of money. :slight_smile: will chk ou the link. Thanks Kameleon

#19

You’re welcome! I’m sure I won’t get rich, but it’s good to get some money back from the time invested :slight_smile: Anyway, I’ll be sure to send you over a copy of what I have as soon as it’s stable :slight_smile: Good luck and keep posting if you have any doubts, I already learned a lot from your questions.

#20

I’ve reached a point where I can call this a product, so here it’s: http://www.youcandoitvfx.com/tools/voxel-creator/

KiTechie, please send me your e-mail so I can send you a copy of this :slight_smile: