Questions/problems with point params in FCP
Questions/problems with point params in FCP
- Subject: Questions/problems with point params in FCP
- From: Peter Litwinowicz <email@hidden>
- Date: Wed, 02 Apr 2008 16:31:04 -0700
- Thread-topic: Questions/problems with point params in FCP
Title: Questions/problems with point params in FCP
Okay,
Here goes: first the header files say point params are designated from the lower left. Not true in FCP, points are specified from upper-left, with Y going down the image. Can someone fix the docs (not sure what Motion does... Haven’t tested). Okay, that one was easy to figure out.
Here’s another issue:
Let’s say I place a point in the upper left corner of the image. I get back (x,y) == (0,0). Which is what I expect. See picture below of what FCP draws when I select the point param in my filter. A red “+” is drawn at (0,0). Cool.
Now let’s say I move the sequence’s center, as seen below.
Note the red “+” does not move with the image. However when I retrieve the point value it is still (0,0). However, if I were to use (0,0) as the point’s value, that pixel in the image (0,0), is not where the red “+” is.
Paul (or someone on the FCP team) can you give me the set of calls I need to make to transform the point so that I can find the corresponding pixel in the image where the red “+” would be? I need this so the user can align where FCP draws the point is and the corresponding (sub)pixel position of that point in the image. I presume there is some combination of anchor and center points and scaling and rotation, but it would be nice if I didn’t have to reverse engineer it :-)
Pete
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