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Value out of a “while loop” decreases when it should not.
Hallo everyone.
Here I’ve got a weird behavior -to me, at least- by an expression and I’d like to understand where’s the mistake I made.
I wanted to have an esteem of the overall distance of a cycling course.
After drawing a mask all along the roads, I pasted it to a null’s position and turned the comp’s framerate to 50 for a higher accuracy.
Then I took Dan Ebbert’s (thank you, your website saves my life almost daily) expression for accumulating random values and I fitted it to my need. At the end, I divided for the maps scale.Now the fun part: the value sometimes decreases, expecially when the path bends.
My knowledge is that a curve may not be represented correctly, but it’s still a vector between two points.
So, can you tell me where’s my mistake?
Thank you.
j = 0; //counter
dist = 0; //distance
p1 = transform.position.valueAtTime(time);
p0 = transform.position.valueAtTime(time-thisComp.frameDuration);while (j<time) {
dist += length(p1-p0);
j += thisComp.frameDuration;
}
dist/comp("scala").layer("Null 4").effect("fattoreConv")("Slider")/10; -
2 Replies
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I think you need to put your p0 and p1 definitions inside the loop (and use j instead of time).
Dan
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Thank you very much.
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