Comments on: single axis aim constraints http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/ more serious than before (in a good way) Sat, 04 Sep 2010 01:29:07 +1000 http://wordpress.org/?v=2.9.2 hourly 1 By: david http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/comment-page-1/#comment-10343 david Thu, 21 May 2009 13:12:01 +0000 http://www.djx.com.au/blog/?p=119#comment-10343 No I'd never tried that. And it works just as you said. Much easier than my solution. Quick summary: A single axis aim constraint works the way we want if the constrained axis comes first in the rotation order (which means last in the way it appears in the attribute editor). So to aim constrain just the Y axis, set the rotation order to XZY. Thanks for the tip! No I'd never tried that. And it works just as you said. Much easier than my solution.

Quick summary: A single axis aim constraint works the way we want if the constrained axis comes first in the rotation order (which means last in the way it appears in the attribute editor). So to aim constrain just the Y axis, set the rotation order to XZY.

Thanks for the tip!

]]> By: verbal007 http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/comment-page-1/#comment-10342 verbal007 Thu, 21 May 2009 00:39:19 +0000 http://www.djx.com.au/blog/?p=119#comment-10342 Have you tried setting the rotation order to XZY? Having Y at the top of the rotation order list seems to force all the transforms to apply only to Y. I have an example file with an arrow pointing at a sphere that I'm moving around the scene in my persp camera and all is good. Great site btw! :) You're tool for freezing out the rotation axis is coming in handy. Have you tried setting the rotation order to XZY? Having Y at the top of the rotation order list seems to force all the transforms to apply only to Y. I have an example file with an arrow pointing at a sphere that I'm moving around the scene in my persp camera and all is good.

Great site btw! :) You're tool for freezing out the rotation axis is coming in handy.

]]> By: david http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/comment-page-1/#comment-10199 david Fri, 12 Dec 2008 08:42:02 +0000 http://www.djx.com.au/blog/?p=119#comment-10199 Thanks for showing us another way. I'll try that out. And sorry wordpress didn't like your code. I'll see if I can rectify that somehow. Thanks for showing us another way. I'll try that out.

And sorry wordpress didn't like your code. I'll see if I can rectify that somehow.

]]> By: yourdaftpunk http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/comment-page-1/#comment-10198 yourdaftpunk Thu, 11 Dec 2008 23:44:32 +0000 http://www.djx.com.au/blog/?p=119#comment-10198 Wordpress killed the code: http://www.djx.com.au/mel/angleBetweenTwoVectors.txt Wordpress killed the code:
http://www.djx.com.au/mel/angleBetweenTwoVectors.txt

]]> By: yourdaftpunk http://www.djx.com.au/blog/2008/12/09/single-axis-aim-constraints/comment-page-1/#comment-10197 yourdaftpunk Thu, 11 Dec 2008 23:36:10 +0000 http://www.djx.com.au/blog/?p=119#comment-10197 You can do this with a short expression that takes the acos of the dot product of two vectors. Because it is a 2D rotation on the X-Z plane, you use 2d vectors and leave Y at 0. Assuming I had a cube shape pointing down the Z axis aimed at a camera: ---code in next comment because wordpress formatting is messing it up--- -shawn You can do this with a short expression that takes the acos of the dot product of two vectors. Because it is a 2D rotation on the X-Z plane, you use 2d vectors and leave Y at 0. Assuming I had a cube shape pointing down the Z axis aimed at a camera:

---code in next comment because wordpress formatting is messing it up---

-shawn

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