Script doesn't remember variables

# 1 17-11-2004 , 04:10 AM

Subscriber
Join Date: Jun 2002

Location: Germany

Posts: 276

Hi all,

this is really my first attempt to dabble in MEL, so be kind, please...

Now, please take a look at the following if-statement.

The reason I post this, is that the script seems to forget the values for $MR_rotX, $MR_rotY and $MR_rotZ as soon as it leaves the if-block. Inside the block everything is fine (I printed the values to the script editor to confirm this), outside the block all values are set to zero. If I delete the if-statement and the brackets, the values remain intact..

Any idea why this happens?

Thanks!

Mario

if ($MR_SnapButton == 1)
{
int $MR_randX = rand (360/$MR_snapx);
int $MR_rotX = $MR_randX*$MR_snapx;

int $MR_randY = rand (360/$MR_snapy);
int $MR_rotY = $MR_randY*$MR_snapy;

int $MR_randZ = rand (360/$MR_snapz);
int $MR_rotZ = $MR_randZ*$MR_snapz;
}

Subdivide and conquer!

Free your mind, and your ass will follow!

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# 2 17-11-2004 , 08:39 AM

Moderator
Join Date: Sep 2002

Location: London, UK

Posts: 3,198

It's because you declare the variables inside the block. When you do that they become local variables to that block. When you try to use them outside of the block you are actually declaring new variables and that's why they show zero in the contents. To make the variables available outside the block you have to declare them in "upper level":

Code:

{
	int $MR_randX;
	int $MR_rotX;
	int $MR_randY;
	int $MR_rotY;
	int $MR_randZ;
	int $MR_rotZ;

	if ($MR_SnapButton == 1) 
	{ 
		$MR_randX = rand (360/$MR_snapx); 
		$MR_rotX = $MR_randX*$MR_snapx; 
	
		$MR_randY = rand (360/$MR_snapy); 
		$MR_rotY = $MR_randY*$MR_snapy; 
	
		$MR_randZ = rand (360/$MR_snapz); 
		$MR_rotZ = $MR_randZ*$MR_snapz; 
	}
}

Kari
- My Website
- My IMDB

Do a lot, Fail a lot and Learn a lot!

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# 3 17-11-2004 , 02:20 PM

Subscriber
Join Date: Jun 2002

Location: Germany

Posts: 276

Yep, already found out. It just had to be some minuscle detail that's so upfront, right under your nose, that you would just overlook it.

Thanks anyway!

Subdivide and conquer!

Free your mind, and your ass will follow!

Quote

# 4 17-11-2004 , 04:13 PM

Moderator
Join Date: Oct 2002

Location: London, UK

Posts: 2,800

it's called "variable scoping" and a scope is defined by {code}

they are hierarchical and so:

int x = 1;
{
int x = 2;
print x (will print 2)
{
int x = 3;
print x (will print 3)
}
}
print x (will print 1)

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Alan

Technical Director - Framestore

Currently working on: Your Highness

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Script doesn't remember variables

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