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1994-07-07
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Magic Camera Frequently Asked Questions
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1. Occasionally, a triangle or parallelogram which is aligned
with the world coordiantes disappears, or appears to have
lots of holes punched into it. What happened?
Answer:
Sometimes a flat primitive which is perpendicular to
one axis of the world will coincide with the edge of a cube of
the octree. In this case, the precision of the calculations may
not be sufficient to determine whether or not an primitive/ray
intersection occurred, causing the primitive to disappear at some
(or, in extreme cases, all) pixels. Typically, this happens
when the anit-aliasing depth is set to zero.
This happens most frequently when using single-precision
versions of Magic Camera.
Solutions:
1. Using the "octbuff" keyword realigns the octree,
frequently solving the problem.
2. Usually, setting anti-aliasing depth to a non-zero
value cures the problem.
3. Moving the object in question slightly (0.01 for
single-precision, 0.0001 for double) also helps.
2. What is the difference between using the single precision
and double precesion versions of MC?
Answer:
All script files should work on both versions of MC.
However, since single precicion numbers take half the storage
space of double precision, the single precision version will
allow more objects to be processed in the same amount of memory.
Single precision is also much faster than double precision on
Amigas without floating point coprocessors, and may sometimes
be faster on Amiga with floating point coprocessors.
However, single precision calculations are not as accurate
as double precision. Therefore, some images make look
slightly worse when rendered with single precision. Also,
patterns such as marble and clouds appear slightly different
when using single precision.
If your Amiga has a math coprocessor, you may use either
version of MC. If you don't have a coprocessor, you MUST
use a single precision version.
3. I get a messages like "included file not found", but the
file is right there. What gives?
Answer:
The path given for the included file and for any bitmaps
must be either absolute (start with a device name,
i.e. Work:path/file) or relative to the directory from which
Magic Camera was executed, not from which the script was executed.
So if the main script and included file are in "Work:MC/Scripts",
and MC is execute from "Work:MC", you should either include
"Work:MC/Scripts/filename" or "Scripts/filename".
4. Spheres and rings don't show up in the preview window.
Answer:
No, they don't. Not yet, anyway. I apologize, but in order
to get this thing out I had to stop coding somewhere, and when I
did, this was one of the things that got left out. However,
it is on the top of my "To Do" list and will be fixed in the
next release.