I suck in Trigonometry

[Dan Ebberts]

I’m confused. Are B and C located on the circle? Is the circle diameter 290, or is the radius 290?

[Roland R. kahlenberg]

Thanks for the reply Dan. The diameter is 290.

Here’s the image of what I’m looking at in my comp.

I obviously have position for A. I also have angles for AB and AC (I don’t have the position for B and C – as stated originally).

I now need position coordinates for B and C. Sense make?

Thanks
RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI

[Dan Ebberts]

From your image, it looks like C is at 306 degrees, which would give you this for C’s position:

angle = 306;
diameter = 290;
center = [thisComp.width,thisComp.height]/2; // position of A

a = degreesToRadians(angle);
r = diameter/2;
center + r*[Math.cos(a),Math.sin(a)]

Dan

[Roland R. kahlenberg]

Thanks Dan! And you were right about the diameter/radius thingy. 🙂

Bestest
Roland

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI

[Roland R. kahlenberg]

AccCKKK!

Points in the first 2 quadrants; from top right work fine. Points on the other 2 quadrants are not accurate.

I’m dealing with 3D layers for the points and each of the cross-sections in the image I first posted are on separate Z-positions. Could this be the issue?

RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI

[Dan Ebberts]

Probably. It depends on what you’re doing with the position values. It might be that you need to include the z coordinate in the position value and then use toComp()to line that up with the camera view.

Dan

[Aimee Murray]

7 hours. I’ve been working with a very similar expression and been so confused as to why it won’t work. Then I see your “degreesToRadians” bit of script and the penny drops. Thanks!