Centre of origin

videodv · Post by **videodv** » Mon Jan 02, 2012 3:24 am

When working out where to put points where is the origin to start from, is it the centre of the document (centre of origin) or top/bottom left/right

Also how do you workout the document size so any points are placed in the correct location.

Many Thanks

Breinmeester · Post by **Breinmeester** » Thu Jan 05, 2012 2:21 am

Yeah, some clarity on that is needed.
As far as i figured, 0,0 is at the exact centre of a layer. The anchor point has its own x and y location, so the point of origin is not depending on its location. The x and y axis are set as a ratio. Meaning that which ever is shorter is 1 unit big and the other is matched accordingly depending on your resolution in the project settings. So if the document is 400x400 x=1 wide and y=1 high. If it's 200x200 same thing. If it's 400x200 x=2 units wide and y=1 unit high.

That's all i know.

hayasidist · Post by **hayasidist** » Thu Jan 05, 2012 3:33 am

what Breinmeester says is right if you have the defaults (zoom=60 and camera at x=0,y=0, z=1.732; vector layer at z=0). but there's a dependence on zoom and (relative) camera z too.

here's the maths: the zoom is the angle of view (the angle from the camera point to the top and bottom of frame - assuming that's the shortest). so half the height of the frame is tan(half the zoom angle)*(cameraZ-vectorZ). in the default that's tan(30)*1.732. tan(30) is 1/(sqrt(3); 1.732 is sqrt(3); so half height = exactly 1. That's Y(max); and Y(min) is - that. multiply by aspect ratio for X(max) and X(min).
if you change the zoom or the relative z then the coords of render area top/bottom/left/right change.

I'll leave you to figure out what happens if you pan /tilt / track the camera.

videodv · Post by **videodv** » Thu Jan 05, 2012 2:02 pm

Thanks guys will be looking at this over the weekend

thanks to you both I have a point of refference I can now work from.

Cheers

videodv · Post by **videodv** » Fri Jan 06, 2012 12:49 pm

Thanks guys

I have got all that worked out and now able to put points on screen/layer where ever I wish.

Regards

videodv · Post by **videodv** » Sun Jan 08, 2012 10:09 am

Just a quick update I now have my first fully working script with a dialog box to change various parameters working, just need to workout how to use the colour swatch to change shape colour to finish.

Thanks for all the help
Regards