Select interseptions objects

Submitted by Anonymous on Wed, 2012-04-18 02:31

I need this script:
Large group of object, for example - heaps of rocks on the ground.
One long complicated object, for example - road. This object curved and interesct with many of little objects - this rocks, bush, grass etc.
I need script what select of objects what intersepted with this complicated long objects.
It hard to develop?

sorry my english.

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JokerMartini's picture
Submitted by JokerMartini on Thu, 2012-04-19 16:47.

Revision

Compact version. Here you go.

fn fnIntersectsSel =
(
	problemObjs = #()
	safeNodes = selection as array
	testers = for i in objects where (findItem safeNodes i) == 0 collect i
 
	for obj in safeNodes do --//test each object in the selection
	(
		for p in testers where intersects obj p do appendIfUnique problemObjs p --//test the intersection to the scene objects
	)
	select problemObjs
)
 
fnIntersectsSel()

John Martini
Digital Artist
http://www.JokerMartini.com (new site)

iunewind's picture
Submitted by iunewind (not verified) on Sat, 2012-04-21 13:02.

Still not (

When i try, it select many of non-intercected objects. Look like it work with bound box, it not enough (

LittleLordPotala's picture
Submitted by LittleLordPotala on Sun, 2012-04-22 03:35.

An idea for you

Select all the small objects that could collide with your master object, then apply a "vol. select" modifier on the selection (so it creates an instanced modifier). Change the modifier parameters as following :
-Stack selection level -> face
-selection method -> replace
-selection type -> crossing
-select by -> mesh object -> and select your big master mesh object

Keep your selection (without the master object)
Then open Maxscript listener, and execute :
arr = #()
for i in selection where (getfaceselection i as array).count > 0 do append arr i
select arr

Just be aware that if you have a lot of objects, the "vol. select" modifier can be slow, it depends of your system specs.

iunewind's picture
Submitted by iunewind (not verified) on Sun, 2012-04-22 06:58.

If i try apply vol select for

If i try apply vol select for small object only and make all us you describe,
It reply "-- No ""select"" function for undefined"
every time, nothing happen.
If i try apply "vol select" to small object with master object, it fantastick slow (on i5-2500k i use array of 7x7x7 boxes for test), i even cant make "select by mesh" and pick mech.

LittleLordPotala's picture
Submitted by LittleLordPotala on Sun, 2012-04-22 15:35.

Collision script

I made a small script to detect quickly the collision with only one "vol select".
Launch the script and there is three buttons :
-First pick the master object
-Pick the collision objects in the "select by name" window
-Click the last button and it will select the objects that collide with the master

I tested on Max 2012 and 2013 with no error message.

AttachmentSize
collision_detection.ms 1.01 KB
iunewind's picture
Submitted by iunewind (not verified) on Thu, 2012-04-26 05:49.

Just see your script,

Just see your script, thaks.
And still not work well (
First my trying was succesfull - i make spheres array and master sphere - work good, select all collision.
After that i try box array and master object extruded from shape - and it select only several boxes from array.
After convert sphere from worked example to polymesh - not work too. Seems to it cannot work with mesh objects, only with standart objects.
And script many times brokeup after first trying - not worked without scene reloading but maybe it because mmaster object was a mesh.
Any way, many thanks, it work with standart objects well and maybe will be helpfull for someone.

LittleLordPotala's picture
Submitted by LittleLordPotala on Fri, 2012-04-27 12:01.

The script will work with

The script will work with primitives and editable_mesh objects, it doesn't work with editable_poly. As workaround, you can add "turn to mesh" modifier or convert to editable_mesh before using the script.
This script use the volume select capabilities, so that means your objects must have enough subdivion (particularly the master object).
I think you could also use the reset xform before converting your objects, it can often resolve weird issues.

I hope that helps.

iunewind's picture
Submitted by iunewind (not verified) on Sat, 2012-04-28 05:52.

i will try, thanks again

i will try, thanks again

JokerMartini's picture
Submitted by JokerMartini on Thu, 2012-04-19 16:44.

Hey

Here you go. Just run this.

fn fnIntersectsSel =
(
	problemObjs = #()
	safeNodes = selection as array
	testers = for i in objects where (findItem safeNodes i) == 0 collect i
 
	for obj in safeNodes do --//test each object in the selection
	(
		for p in testers do --//test the intersection to the scene objects
		(
			if intersects obj p do
			(
				appendIfUnique problemObjs p
			)
		)
	)
	select problemObjs
)
 
fnIntersectsSel()

John Martini
Digital Artist
http://www.JokerMartini.com (new site)

JokerMartini's picture
Submitted by JokerMartini on Thu, 2012-04-19 16:15.

I'll make ya something. Ill

I'll make ya something. Ill be back with a script.

John Martini
Digital Artist
http://www.JokerMartini.com (new site)

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