Subject:
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Re: My humble opinion about LDraw animation
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 24 Aug 2005 15:38:31 GMT
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Viewed:
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3091 times
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In lugnet.cad, Damien Guichard wrote:
> Before i attempt anything i will now carefully consider:
> * what POV-Ray can do
> * how it does
> * whether i can do easier/better
I mostly agree with James (use POV-Ray for animations), but I'll throw my 2
cents in anyway ...
It seems like an LDraw-based animation format is reasonably possible, with the
following requirements/additions:
- Use MPD format. This isn't totally required, but as James has documented, it
is a Very Good Idea.
- Support the LDLite language extension. This includes meta-statements such as
ROTATE, TRANSLATE, SCALE, POINT, and MATRIX, and enhanced syntax to use defined
POINTs and MATRIXs in normal LDraw statements.
- Some concept of variables and expressions.
- A Timer system variable
- An ANIMATE meta-statement, giving the paremeters to control the animation.
- An IF/END IF block meta-statement. This would be important for any animation
other than very simple single-action animations.
OK, that list is longer than I thought it would be. But most of the items on
the list are relatively straightforward to implement. At least, they are well
known and well-solved programming problems. The code to support LDLite language
can be gotten/adapted from the ldglite source code. That gives a base for block
statements and variables. Parsing/interpreting expressions is a common
scripting challenge, the logic/code should be available somewhere.
A program to process such a script could take an animation (.LDA?) source file
as input, and generate a standard LDR file (or series of files) for output.
We've already got programs that can render images, no need to reimplement that.
The key-frame processor suggested by Orion-2 is interesting, but sounds harder
to implement...
Steve
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Message has 1 Reply:
Message is in Reply To:
 | | Re: My humble opinion about LDraw animation
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| (...) Many thanks to you James, your experience is priceless to me. Before i attempt anything i will now carefully consider: * what POV-Ray can do * how it does * whether i can do easier/better * if people don't want to learn POV-Ray, then they (...) (19 years ago, 23-Aug-05, to lugnet.cad)
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