POV-Ray : Newsgroups : povray.binaries.images : Ivy Generator Server Time
3 Aug 2024 00:23:36 EDT (-0400)
  Ivy Generator (Message 11 to 14 of 14)  
<<< Previous 10 Messages Goto Initial 10 Messages
From: Thomas de Groot
Subject: Re: Ivy Generator
Date: 18 Mar 2007 04:55:02
Message: <45fd0c76@news.povray.org>
An overgrown statue.
A file size of 223 mb for the ivy (2mb for the statue).
In v3.7:
parse time: 81 CPU seconds (1 thread)
trace time: 6 minutes (2 threads)

There are a number of issues one has to take into account:
- the x-axis orientation is switched between the Generator and Poseray. This 
may give problems with assymetrical objects. Just inverse then the Ivy 
object along x.
- As said by Jeremy already: watch out for the transparency mapping.
- several of the sliders work differently from what is expected.
- make sure your obj file is correct. I started using obj generated by Silo 
(which work perfectly otherwise) but in the Generator they showed only half 
the triangles as opaque. Solution was to pass the obj file through Poseray 
and export again as an obj file. Worked correctly.
- The generator by default turns the normals inwards.

Thomas


Post a reply to this message


Attachments:
Download 'GrowingIvyTest.jpg' (105 KB)

Preview of image 'GrowingIvyTest.jpg'
GrowingIvyTest.jpg


 

From: Thomas de Groot
Subject: Re: Ivy Generator
Date: 18 Mar 2007 10:29:14
Message: <45fd5aca$1@news.povray.org>
OK. Some further testing.
The axis orientation is posing problems. Should be simple though  :-(
I thought simply scaling x by -1 would be enough, but it isn't. There is 
more involved. IvyGenerator is right-handed I suppose, so exporting in 
POV-Ray orientation through Poseray an object not centered on the origin, 
you may need to:
scale <-1,1,1>
rotate <0,-90,0>
translate <a given amount over x, maybe z>

At least, that is what I come up with.

Thomas


Post a reply to this message

From: Kenneth
Subject: Re: Ivy Generator
Date: 21 Mar 2007 04:30:02
Message: <web.4600fa14e71b54f1d41bc31b0@news.povray.org>
"Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> An overgrown statue.

Nice image, Thomas!  I'd like to see further work on this.

KW


Post a reply to this message

From: Thomas de Groot
Subject: Re: Ivy Generator
Date: 21 Mar 2007 10:50:08
Message: <46015430$1@news.povray.org>
"Kenneth" <kdw### [at] earthlinknet> schreef in bericht 
news:web.4600fa14e71b54f1d41bc31b0@news.povray.org...
> "Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
>> An overgrown statue.
>
> Nice image, Thomas!  I'd like to see further work on this.
>

Thanks Kenneth! I am working on a couple of image for the 'before-after' 
topic where the ivy will be present. As well as the statue by the way, but 
not overgrown.

Thomas


Post a reply to this message

<<< Previous 10 Messages Goto Initial 10 Messages

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.