problem with ssc

viskey · 5th December 2004, 17:43

i tried to make a nice 3d ssc with the megabuf-thing. that works so far. but when the scope gets larger (you'll see what i mean when you download the attached file) it sometimes gets behind the camera. then those ugly lines appear. i have tried different things to get rid of them but none of them worked. i hope someone can help.

hboy · 5th December 2004, 20:05

some veeeeery familiar code here

. i had also an idea to do a version like this, but I liked my original version more. actually i get no lines you described, but I see no line skipping in the last scope, so maybe that is your problem.

viskey · 5th December 2004, 21:35

yes i tried the method you used in your new pack

(i try different things for more than a week now so i look in every preset in wich a ssc moves behind the camera

). i have seen now that i used it wrong :P . now i modyfied it so it should work now but it doesn't. so i have to go on trying different things .... or anyone can help me

S-uper_T-oast · 6th December 2004, 00:52

You are right in useing skip, the hard part is figuring out at what point you need to skip. You have to remeber you need to skip both positive and negative z values. (abs value)
I don't remeber were the cutoff is, but it's something like that.

TomyLobo · 6th December 2004, 01:25

nice scope idea

about the skip... use a threshold that is a bit above 0.
it depends on the scale of your coordinates.
also, use this piece of code for skipping, so a line is skipped when either of its end points is behind the camera.

code:


nskip=above(zvalue,0.1234);

skip=nskip+lskip;

lskip=nskip;

btw, if your code becomes more complex and you need loops, ifs with code in them, do a lot of megabuf assignments or simply want to shorten your code, you might be interested in this APE

PAK-9 · 6th December 2004, 09:59

one of the problems is that a line can span 'from' behind the camera or 'to' behind the camera, you need to account for both cases. The skip if z is above a certain number method will still work, but only if your lines are pretty short. To be sure you can say skip if z>longest length a line will be

TomyLobo · 6th December 2004, 14:25

that's exactly what my piece of code takes care of, pak

PAK-9 · 6th December 2004, 16:41

I get bored quickly, I usually only read the first couple of posts before I blurt out a reply

viskey · 6th December 2004, 18:43

thanks for all the replies. havn't tried it yet but i will do that later.

6th December 2004, 01:25	#5
TomyLobo Major Dude Join Date: Feb 2004 Location: Germany Posts: 578	nice scope idea about the skip... use a threshold that is a bit above 0. it depends on the scale of your coordinates. also, use this piece of code for skipping, so a line is skipped when either of its end points is behind the camera. code: nskip=above(zvalue,0.1234); skip=nskip+lskip; lskip=nskip; btw, if your code becomes more complex and you need loops, ifs with code in them, do a lot of megabuf assignments or simply want to shorten your code, you might be interested in this APE If you can't say something nice, say something surrealistic.

6th December 2004, 09:59	#6
PAK-9 Major Dude Join Date: Oct 2002 Location: The United Kingdom of Great Britain and Northern Ireland Posts: 1,374	one of the problems is that a line can span 'from' behind the camera or 'to' behind the camera, you need to account for both cases. The skip if z is above a certain number method will still work, but only if your lines are pretty short. To be sure you can say skip if z>longest length a line will be http://PAK-9.deviantart.com ...innit

6th December 2004, 14:25	#7
TomyLobo Major Dude Join Date: Feb 2004 Location: Germany Posts: 578	that's exactly what my piece of code takes care of, pak If you can't say something nice, say something surrealistic.

6th December 2004, 16:41	#8
PAK-9 Major Dude Join Date: Oct 2002 Location: The United Kingdom of Great Britain and Northern Ireland Posts: 1,374	I get bored quickly, I usually only read the first couple of posts before I blurt out a reply http://PAK-9.deviantart.com ...innit

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5th December 2004, 20:05	#2
hboy Senior Member Join Date: Dec 2003 Location: Hungary Posts: 217	some veeeeery familiar code here . i had also an idea to do a version like this, but I liked my original version more. actually i get no lines you described, but I see no line skipping in the last scope, so maybe that is your problem.

5th December 2004, 21:35	#3
viskey Junior Member Join Date: Sep 2003 Location: Germany Posts: 11	yes i tried the method you used in your new pack (i try different things for more than a week now so i look in every preset in wich a ssc moves behind the camera ). i have seen now that i used it wrong :P . now i modyfied it so it should work now but it doesn't. so i have to go on trying different things .... or anyone can help me

6th December 2004, 00:52	#4
S-uper_T-oast Forum King Join Date: May 2003 Location: Fnord?! Posts: 2,653	You are right in useing skip, the hard part is figuring out at what point you need to skip. You have to remeber you need to skip both positive and negative z values. (abs value) I don't remeber were the cutoff is, but it's something like that.

6th December 2004, 18:43	#9
viskey Junior Member Join Date: Sep 2003 Location: Germany Posts: 11	thanks for all the replies. havn't tried it yet but i will do that later.