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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 17 Aug 2011, 16:31 
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iamVFX wrote:
dwigfor wrote:
Part 3 is now online: Parenting_Position
(Introducing "Multiply Vector by Matrix")

wow, I didn't even know that rotation is matrix and can provide local transforms. that's cool, thanks!


A rotation is not a matrix, it is a vector [which represents the rotation axis] and a angle [expressed in degrees or radians representing the amount of rotation around the axis].


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 13:20 
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TwinSnakes007 wrote:
iamVFX wrote:
dwigfor wrote:
Part 3 is now online: Parenting_Position
(Introducing "Multiply Vector by Matrix")

wow, I didn't even know that rotation is matrix and can provide local transforms. that's cool, thanks!


A rotation is not a matrix, it is a vector [which represents the rotation axis] and a angle [expressed in degrees or radians representing the amount of rotation around the axis].

you know what i mean :-j so that it can be converted into 3x3 matrix

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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 14:53 
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Part 4 is online: Parenting_Rotations



Important to remember: Child Rotation * Parent Rotation


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 14:58 
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Part 5 is online: Parenting_Simplified



Important to Remember: Child Local Transform * Parent Global Transform = Child Global Transform

I forgot to mention that I had already offset the Child's position in the SRT to Matrix node back in Tutorial 2.


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 15:03 
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Rork wrote:
Please stick to Vimeo.

I do understand the Google requests, but on Vimeo at least there's some organizing going on.

And you don't get retarded comments on the videos you're posting ;-)



I tried Vimeo before, but I think the files are too big. I'll see if I can recompress them, because I would like to include these with everyone else's stuff... What settings are recommended?


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 15:15 
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I can convert them to mp4 for ya, if you're stuck.

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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 15:22 
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TwinSnakes007 wrote:
iamVFX wrote:
wow, I didn't even know that rotation is matrix and can provide local transforms. that's cool, thanks!


A rotation is not a matrix, it is a vector [which represents the rotation axis] and a angle [expressed in degrees or radians representing the amount of rotation around the axis].


Sorry for the confusion. I think I even made a comment like "oh I thought I needed to convert that before" while recording it... I run into the problem when multiplying the rotations together, so then I convert the matrix back to rotation. Yes, I believe rotation is a 4D vector (X, Y, Z, W). You can convert rotation into a rotational matrix by plugging "Axis and Angle to Rotation" -> "SRT to Matrix" -> "3x3 Matrix". I did intend to use "Multiply Vector by Matrix", but should have converted it to 3x3 matrix first. I'll have to look into using just a "Multiply" node as TwinSnakes007 mentioned earlier.. Never tried that...

I've got some other tutorials that I'd like to offer, but I ran into a problem with my next one that needs sorting out.. I got some flipping issues when I was creating my Turret setup. Need to open an earlier project to see how I solved it.. I think I may have used ArcTan2 rather than Increment Rotation by 2 Vectors, so I gotta relearn that... :)

Thanks for watching!
-Dave


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 16:12 
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xsisupport wrote:
I can convert them to mp4 for ya, if you're stuck.


I appreciate the offer, Stephen! Do you need the source files? They're fairly large (probably 6 gig in total).

What resolution does everyone record their videos at?


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 18 Aug 2011, 16:54 
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dwigfor wrote:
xsisupport wrote:
I can convert them to mp4 for ya, if you're stuck.


I appreciate the offer, Stephen! Do you need the source files? They're fairly large (probably 6 gig in total).

What resolution does everyone record their videos at?

I have Camtasia Studio, so I would load the .avi and export it as .mp4.

Or could you just download the .flv from youtube and use that?

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// "You're not a runner, you're just a guy who runs" -- my wife
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// My Blogs: Arnold | Softimage


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 Post subject: Re: TUTORIAL: Intro to ICE Kinematics
PostPosted: 26 Aug 2011, 10:20 
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Finally got these up on Vimeo. If someone else needs help with it, I used Adobe Media Encoder and set it to Vimeo HD. Takes a long time for Vimeo to convert it, though... Much longer than Youtube...


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