Extended Channels and *.chan... Is that bug?

Forums Technical Discussion Extended Channels and *.chan... Is that bug?

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hoknamahn: Member; 398 posts; Joined: July 2005; Offline

March 23, 2006 6:34 a.m.

Try to extend a channel by Extend CHOP and save that channel to *.chan/*.bchan file (with *.clip/*.bclip all must be okay) and read that file back. I'm sure you will see just old channel, not new “extended” channel. So is it bug?

f = conserve . diffuse . advect . add

fx td @ the mill


edward: Member; 7733 posts; Joined: July 2005; Online

March 23, 2006 6:41 a.m.

As you'll note in the CHOPs Viewer, the Extend CHOP simply modifies the conditions of how the channel is evaluated past it's end points because only the dotted lines change. Since the .chan file format only records the actual data points, this information is lost if you use it. I think the .chan format dates back to PRISMS for which extend conditions didn't exist?


hoknamahn: Member; 398 posts; Joined: July 2005; Offline

March 23, 2006 7:21 a.m.

I see your point but why we can't save the _raw_ values of extended channel to *.chan? In the theory nothing can't stop us from grabbing any value and saving it.

ops:

f = conserve . diffuse . advect . add

fx td @ the mill


edward: Member; 7733 posts; Joined: July 2005; Online

March 23, 2006 10:54 a.m.

But extend conditions extend to infinity. So how many raw values should it write out?


hoknamahn: Member; 398 posts; Joined: July 2005; Offline

March 23, 2006 11:17 a.m.

So how many raw values should it write out?

I think `$RFEND - $RFSTART + 1`

f = conserve . diffuse . advect . add

fx td @ the mill


edward: Member; 7733 posts; Joined: July 2005; Online

March 23, 2006 12:01 p.m.

That may or may not be valid though. Have you tried opsave?


hoknamahn: Member; 398 posts; Joined: July 2005; Offline

March 24, 2006 4:07 a.m.

What do you mean, Edward?

f = conserve . diffuse . advect . add

fx td @ the mill


edward: Member; 7733 posts; Joined: July 2005; Online

March 24, 2006 9:55 a.m.

I mean, that may or may not be what the user wants. Esp. if they have chop data that exceeds the range .

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