Isai, CG Generalist

Frame-by-framing in YouTube and Vimeo!

2018-10-09T12:41:00.004-04:00

On Vimeo:
Shift + Left Arrow
Shift + Right Arrow

On YouTube:
,
.

Sources:
https://motionarray.com/blog/learn-how-to-go-frame-by-frame-on-a-vimeo-video
https://www.quora.com/How-do-you-watch-YouTube-videos-frame-by-frame

IK FK snapping!

2018-10-05T16:22:00.001-04:00

Currently having trouble snapping an IK setup to FK. I'm working with the rigger on this (BIG advantage).

The setup:
IK Animation Controls are usually offset a bit from the Joint they drive, either in Translation, Rotation, and sometimes both (rare case). This is so that animators have controls that behave appropriately in world-space.

The problem:
Each IK control SHOULD match to the Joint that is being driven, but because of the offset, snapping can be difficult.

The solution:
Get the offset values when the rig is at its default pose during the rig-creation process! This value can be used to snap the Control to the Joint, then Constrained with the recorded offset, baked, and now you have the IK with the exact animation pose as the FK control!

How it works:
When the rigger creates a new Control and places it accordingly in relation to the Joint, there is a value (known by the rigger).

MATH!!!

So, the actual math is a bit beyond me, but the logic is there. The idea is simple.

On the rigging end:
- Get the Joint's world Transformation values, inverse it (JTI)
- Get the Control's world Transformation values (CT)
- Multiply the CT x JTI (the order is important when doing Matrix Math)
- Store the output in the Joint itself as an attribute
Sample code:
stored_values = control.worldMatrix.get() * joint.worldMatrix.get().inverse()
joint.ikOffset.set(str(stored_values))

On the animation tool end:
- Get the current world-location of the Joint (J)
- Get the offset position relative to the Joint, stored in the attribute (O)
- Multiply O x J
- Apply the new world-Transformation (translation, rotation, or both) values to the Control!
Sample code:
matrix_offset = pm.dt.Matrix(list(eval(stored_values_string)))

new_matrix = matrix_offset * joint.worldMatrix.get()
control.setTranslation(new_matrix.translate,space='world')
control.setRotation(new_matrix.rotate,space='world')

Here's what the full code would look like using Pymel!

import pymel.all as pm
joint,control = pm.selected() # Get the Joint and Control

# Multiply the Control's worldMatrix times the Joint's Inverse worldMatrix to get the offset
stored_values = control.worldMatrix.get() * joint.worldMatrix.get().inverse()
joint.ikOffset.set(str(stored_values))

# Store the value on the Joint itself as "ikOffset"
stored_values_string = joint.ikOffset.get() # For this exercise, I'll use the value below instead as an example
stored_values_string = '[[0.279186612049, 0.96009314151, -0.0166131056216, 0.0], [-0.835911951206, 0.251517268104, 0.487842468094, 0.0], [0.472552690695, -0.122311992345, 0.872773585213, 0.0], [-5.74275377315, 1.40332190313e-12, -14.0587247215, 1.0]]'
matrix_offset = pm.dt.Matrix(list(eval(stored_values_string)))

new_matrix = matrix_offset * joint.worldMatrix.get()
control.setTranslation(new_matrix.translate,space='world')
control.setRotation(new_matrix.rotate,space='world')

Sources:
Convert string to list
http://forums.devshed.com/python-programming-11/convert-string-list-71857.html

Math is Linear Algebra. Someone taught me how it works, so I'm still looking for a good tutorial on it!

2018-09-21T18:46:00.006-04:00

Need to enable playback on all viewports at the same time?

Go to preferences > Time Slider>Playback and change Update View from Active to All.

Source:
https://forums.cgsociety.org/t/scrub-animation-in-all-viewports/1524209

Get distance between two points

2018-09-05T16:25:00.001-04:00

Question was simple. Get the world position of any item in space throughout the entire timeline, then compare each point to get the frame-by-frame traveled distance.

With pymel, first get the item:

import pymel.all as pm
item = pm.selected()[0]

Get the frame range and turn off cycle check:

start_time = pm.playbackOptions(q=1,animationStartTime=1)
end_time = pm.playbackOptions(q=1,animationEndTime=1)
anim_range = range(int(start_time),int(end_time))
pm.cycleCheck(evaluation = 0)

Then, get its worldMatrix at every frame:

item_values = [pm.getAttr(item.worldMatrix,time=t)[-1][:-1] for t in anim_range]

To figure out the difference between frames, I didn't know how to do, so after some searching, this post had the most concise result:

https://stackoverflow.com/questions/1401712/how-can-the-euclidean-distance-be-calculated-with-numpy

And finally, the code needed to get the differences

per_frame_change = []
for i in range(len(item_values)-1):
per_frame_change.append(numpy.linalg.norm(item_values[i] - item_values[i-1]))

Here's the whole code!

import pymel.all as pm
import numpy
start_time = pm.playbackOptions(q=1,animationStartTime=1)
end_time = pm.playbackOptions(q=1,animationEndTime=1)
anim_range = range(int(start_time),int(end_time))
pm.cycleCheck(evaluation = 0)

item = pm.selected()[0]
item_values = [pm.getAttr(item.worldMatrix,time=t)[-1][:-1] for t in anim_range]

per_frame_change = []
for i in range(len(item_values)-1):
per_frame_change.append(numpy.linalg.norm(item_values[i] - item_values[i-1]))

Highlight duplicate inputs in Google Sheets

2018-08-21T14:44:00.001-04:00

We use Google Sheets to track one-off assignments (shots that need fixing). I realized that some shots were coming in as duplicates, so I found this handy idea to detect duplicate inputs.

https://www.nichemarket.co.za/blog/excel-google-sheets-like-pro/

Here's the snippet from the above link (all credit to the poster):

Select the the whole column or range you would like to dedup.
Frome the menu, select Format >> conditional formatting. The conditionalformating toolbox will open which looks like this:
From the drop down menu under “Format Cell If”, select “Cutsom Formula is” and add the following condition:
=countif(B:B,B1)>1*
* Where B is the colum you are trying to dedup.
Choose a formatting style so you can quickly identitfy duplicated cells.
Select Done and you good to go!

3DS Max CAT Gimbal problem - Solution!

2014-04-03T09:41:00.001-04:00

Recently, I've been looking for a way to fix this, and no where did I find a solution... So I analyzed the CAT tools, and finally, I discovered the solution that WORKS!

I will explain the first problem, a simple solution to the first problem, a second MAJOR problem, and a somewhat complex (but built-in to CAT's tools) solution:

Problem 1: A CAT-rigged character with a T-pose in Max will not have a properly working spine control. Whenever the hips rotate, so does the spine.

Solution 1:

Select the Chest Control
Under Hierarchy>Link Info>Bone Hierarchy>Inheritance>Animation Mode, turn off "Inherit Rotation". This will allow separate rotation between the hips and spine.

Problem 2: When "Inherit Rotation" is turned off, the rotation tools in the Viewport work perfectly, but once in the Graph Editor, both X and Z rotation are flat on top of each other and must be counter-animated, also known as a Gimbal Lock.

Solution 2:

Select the Chest Control
Hierarchy>Link Info>Bone Hierarchy>Inheritance>Animation Mode

Turn ON "Inherit Rotation" (undo what was done in Solution 1).

Hierarchy>Link Info>Inherit>Rotate, turn OFF X, Y, and Z.
Motion>Euler Parameters

Axis Order: YZX
Rotation Axis: Y

If you work a lot using the graph editor, you will immediately notice how much faster your workflow will be. Enjoy!

MatchMoving!!

2013-11-19T21:24:00.001-05:00

I've been researching a few techniques to fix my latest render file, so I've resorted to simply re-doing the MatchMoving (the technique to match the camera to a cg environment). I'm hoping that this helps me with my scene!

This is the tutorial that I found:

I'll upload my findings later :)

Expanding my creative toolbelt

2013-11-07T14:23:00.000-05:00

In the past few years, several well-respected VFX and Animation companies went under. A few other ones received huge hits in layoffs. This was an obvious sign of the times of the VFX industry, and I knew that with the ever-growing pool of talented artists, my chance of breaking into the industry was very slim.

I decided to do something about it.

I studied Character Animation, and as much as I love the art-form, I slowly realized (through artists that lost their jobs due to the excess of similar/senior artists that companies had) that applying for work with only that ability would not aide me in the short term, so instead I decided to learn something new, and Animation Mentor was going in a very interesting direction with it.

They introduced their Collaborative Animation Classes, where students work together to make a short film. A few months later, Bobby Beck (CEO and co-founder of Animation Mentor) announced the VFX Fundamentals Course. Students would go through learning Autodesk's Maya, SolidAngle's Arnold rendering technology, and The Foundry's Nuke.

This was my chance. A few months beforehand one of my teachers told me that if I can, find an art-form that will complement what I already know, and Visual Effects seemed ideal.

It has now been almost 10 months since I decided to apply. And here are my findings:

I love it.

Rendering, figuring out how to use multiple software packages to improve what is given to me, and improving on already-amazing animation is extremely gratifying. Every time I tweak something, or learn something new, time slows down, and I feel the art-form just taking me in. It is truly amazing.

With all this, I have decided to start writing on my blog again. Every minute I spend on this, I discover something new, and when I try it, I discover a new problem that I need to overcome. The best part is, I don't ever feel bored whenever I encounter something different! My hands are literally shaking as I write this. Just thinking about it makes me giddy!

For CG Basics (the first Class), our mentor was Scott Liedtka, a Visual Effects Supervisor at Tippett Studio. He is an amazing mentor, from whom I learned an amazing amount of information. He is a great conversationalist, and the way he explains complex concepts is fantastic. It is obvious that he enjoys talking about the subject, and that is what makes a good teacher in my book.

Now I am in Lighting Basics with Bruce Powell. He is credited as a CG Sequence Supervisor at ILM, and has worked on Pacific Rim, one of my favorite movies this year. His eye for detail is really sharp, and every time he points something out, it opens my mind to a new concept. This has happened many times already, and I'm sure it's not the last.

I hope that this refreshed blog will serve as a good support for anyone interested in the Animation Mentor community.

As Scott Liedtka said to us on our first day of CG Basics, "Do cool shit!"

AME: Class 1, Assignment 2: Light vs. Heavy

2012-05-30T14:51:00.005-04:00

Assignment 2: One light ball, one heavy ball!

AME: Class 1, Assignment 1: Bouncing Ball

2012-05-30T14:50:00.001-04:00

Here's my first animation for my personal competition of: AnimationMentor EXTREME Edition!!

I'll be uploading these onto YouTube as a channel as well! Enjoy!

New Reel!

2011-06-05T22:58:00.001-04:00

So, ladies and gents, here's my brand new Demo Reel! It's only 2 shots, but I feel they are nice enough to post on my site as finals. Enjoy! :)

Latest Performance Animation Reel from Isai Calderon on Vimeo.

Here's my latest performance animation Reel!

*All rigs provided by Animation Mentor. All animation done by me!

Blake Norris

2010-12-06T11:56:00.000-05:00

New Word of the Day Challenge - Laconic

2010-10-19T14:57:00.000-04:00

Turns out I need to practice my facial animation. So, I came up with a very nice idea: Take the Word-of-the-Day from Dictionary.com, and animate Bishop 2.0, from Animation Mentor, saying that word. Yesterday's word was laconic:

–adjective
using few words; expressing much in few words; concise: a laconicreply.

I began this challenge with Martha Murrie, a fellow AMer. Here's my resulting animation for the first WotD Challenge:

And here is Martha's WotD, same word, different acting choice:

Class 3 - Assignment 2 - Intermediate Stewie!

2010-05-10T14:46:00.001-04:00

Reference: Heavy Sword from Isai Calderon on Vimeo.

Here's the reference for my next animation. Stewie will be swinging a heavy, two-handed sword. Enjoy!

Class 3 - Session 6 - Intermediate Stewie from Isai Calderon on Vimeo.

Here's my next animation :) This is Stewie in sequence to what happened in the last video. He is now a little stronger, and an enemy appeared. He attacks (kind of)!

Class 3 - Session 3 - Amateur Stewie!

2010-04-18T20:46:00.002-04:00

Amateur Stewie from Isai Calderon on Vimeo.
Sorry I haven't posted anything lately :( Work has me extremely busy, so Blog maintenance has gone down quite a bit.

Here's my newest video. Amateur Stewie! Blocking-Plus stage!

Class 2 - Session 5 - Blocking

2010-02-10T19:41:00.001-05:00

Class 2 - Session 5 - Blocking from Isai Calderon on Vimeo.

This next animation is of a drunk armless Stewie. In it, he's stumbling to get onto his feet, but fails and falls. Once again, any critique is welcome :) This is the blocking stage.

Class 2 - Session 3 - Polishing

2010-01-25T13:13:00.001-05:00

Class 2 - Session 3 - Polishing from Isai Calderon on Vimeo.

This is the Polishing Pass. Here, I've set all the curves into Splines. This means that, different to the last video, instead of looking like it's skipping frames, the character looks like a more smooth animation now. Next up, Refining. Enjoy!

Class 2 - Session 1 and 2 - Reference and Blocking

2010-01-17T22:43:00.005-05:00

Class 2 - Session 1 and 2 - Reference from Isai Calderon on Vimeo.

Here's the reference I'm using for my next assignment. It's start/stop animation with a 360 turn. I will be using this to animate Ballie doing pretty much the same movements, with a few variations.

Class 2 - Session 2 - Ballie 360 from Isai Calderon on Vimeo.

And here's the first pass. The blocking. If you have any critiques to make it better they are all greatly appreciated!

Interview animation, 001

2009-11-11T00:43:00.003-05:00

Please leave your critiques on this animation below :) Any comment to make this animation better is greatly appreciated.

RobotArm Animation

2009-08-27T12:13:00.003-04:00

Here's the result for my next assignment. Pick up cylinder, and place it somewhere else. This assignment was to learn how to animate in Maya, so it's not officially critiqued. Any comments are welcome :)... If it's a mean one, please make sure to give pointers on how to make it better, not just say it's crap... You get the idea :) No one likes bad critiques... Enjoy!

RobotArm_Anim from Isai Calderon on Vimeo.

Maya Update: First Animation

2009-08-12T14:07:00.011-04:00

So, we started the animation part of the Maya Springboard program. I had fun animating this first animation for, well, AnimationMentor. But first, an update on my last scene. I think it came out ok :) What do you think?

And here's the video. It's a playblast.

Animation assignment 1: Ball and Piston from Isai Calderon on Vimeo.

Maya, here we come!

2009-08-03T13:11:00.004-04:00

So, I recently began the Maya Springboard Program; a.k.a. massive Maya learning experience. Here's the resulting product of 1 week of work in Maya. First, I made the character (no joints, bones, or anything technical) out of pure geometry, and I think it came out ok for someone that doesn't do a lot of modeling.

Then came the Scene. Here's some screenshots. I'll be adding a few more things to it every day I learn something new.

Demo Reel Update 04/09

2009-04-29T23:50:00.003-04:00

Here's an updated Demo Reel. Enjoy!

Demo Reel, 04/09 from Isai Calderon on Vimeo.

Jimbo and Skeeter VS. The Apocalypse

2009-03-27T20:43:00.004-04:00

This is a new game featured with the Blade Engine, previewed at GDC '09. I made several animations in the game. Here are a few of two of all the enemies: The Hellhound, and the Chicken Mech (I know it doesn't look like a chicken, but it's supposed to act like one. The game is called Jimbo and Skeeter vs. The Apocalypse, which is still in Beta, and the company I worked with is Gaslight Studios.

Jimbo and Skeeter VS. The Apocalypse from Isai Calderon on Vimeo.

Animation Demo Reel

2009-03-19T04:44:00.005-04:00

Ladies and gentlemen. I give you the mighty Animation Demo Reel. I hope you all like it :)

Animation Demo Reel (Updated) from Isai Calderon on Vimeo.

Also, as you can tell, I've decided to redesign my website a little for better viewing. Enjoy the show! :)