ADAM REPOSTS

starexorcist: battasenpai: some nice programs to draw mtPaint: free source tool designed to make...

Wed, 03 Apr 2013 18:11:20 +0100

battasenpai:

some nice programs to draw

mtPaint: free source tool designed to make pixel art. for Linux or Windows.

character maker: it’s to make charsets for rpgmaker but you can use it for whatever you want. it’s in both english and spanish.

scribblertoo: really nice website to draw with.

sekka: free source tool to draw things like these:

All of these programs are super helpful and freeeeee

woof I need dis

1ucasvb: Easing functions are an immensely useful tool for...

Sat, 16 Mar 2013 01:08:35 +0000

1ucasvb:

Easing functions are an immensely useful tool for animators. They are very handy when we want to spice up an animation and give it an extra cool or polished look, and are incredibly simple to implement in code.

The main idea is that you have a starting point A and an ending point B, and you want something to move from A to B along a (not necessarily straight) path connecting both points.

However, the path between the points is not the only thing to consider: there’s also how the object will traverse this path, how fast it’ll move at each point, how it will accelerate, etc.

What we are looking for is a uniform “speed” parameterization of the path, that is, we want a function f(t) that returns a point in space along the path. The function is built so f(t=0) gives us the starting point and f(t=1) gives us the ending point. Additionally, for equally spaced values of t in the unit interval [0,1], we want equally spaced points along the path.

Unit speed parameterization of curves is not a trivial thing, but for a straight line path using linear interpolation — which is by far the most common — it is very straightforward: we don’t have to do anything. It is already uniform in speed!

This is where easing functions come in. The easing function e(t) takes an input value t, from 0 to 1, and returns a new value, not necessarily from 0 to 1 (to account for overshoots). The only constraint is is that e(0) = 0 and e(1) = 1. The value returned by the easing function is what we use to get the current position along the path.

In math terms, if our path is given by f(t) and our easing function is e(t), we’ll use f(e(t)) in our animation code.

In the animation above, you see the result of using several different easing functions on a simple linear path.

The horizontal value of each graph is the t time parameter, and the vertical value is the value returned by e(t). The box delimits the interval from [0,1] in both directions.

Shown at right of each graph is the movement you get with this easing function. You can see that even the slightest variation from the super-lame straight line (top left) is already much nicer to look at.

The functions shown here were all custom made, and are part of my personal animation library. Linear, power and sine are found everywhere, and are the most basic ones.

Most libraries also include “elastic” and “bounce”, among others, but these are always fixed Bézier curve or polynomial approximations, which are pretty bad since you can’t fine-tune them to your needs. So I wrote my own.

The trade off for being totally tunable is that they are not optimized for real time, but that isn’t an issue for me.

You’ll also notice that I haven’t included ease-in and ease-out separately. I find it mostly useless. I’ve never seen anyone using “elastic/bounce ease in”, for instance, and I hope it has never been used by anyone. It looks like garbage, as you can see when the animations run backwards.

In any case, creating mixed functions from these is very easy, just a matter of acting in reverse on half the interval, and subtracting the function from 1 for the ease-in parts.

POWER

This is usually found in three flavors out there: quad(tratic), cubic and quart(ic). I decided to just wrap them all in the same thing, as it’s the same construction, except using different powers

The idea is to use a variation of t^p and its reflection to create the ease-in and ease-out bits.

In particular, you have (2t)^p/2 for t in [0,0.5] and 1 - (2(1-x))^p/2 (non-expanded for clarity) for t in (0.5,1]. All values p > 0 are well-behaved in the unit interval.

SINE

This one is just simply sin(t·π/2)². You can easily get rid of that power using the familiar identity, but it looks cleaner this way.

BOUNCE

The bounce one is based on the actual physics of parabolic motion. It is tuned by two parameters: decay power and number of times it hits the ground. This means you can set, precisely, how many times you want it to bounce around, and you can fine tune how sharply it will lose energy after each bounce.

I usually avoid using exponential decay on its own because it doesn’t reach zero exactly at the end of the interval, which is usually more desirable than physically accurate decay rates. So I tend to use a factor of (1-t)^p for decays in general. It offers more freedom anyway.

PHYSICAL

Most libraries include “elastic” and “back” (which overshoots a bit). They look all right, but are not accurate models of physical motion, and you can’t fine tune them much.

My “physical” easing function replaces both with a solution for dampened harmonic oscillation, where you can manually set the decay rate and frequency of oscillation. This means you can have exactly as many back-and-forth motions as you want. The exponential decay rate was also replaced by the more malleable (1-t)^p expression.

Using frequencies like 1 or 0.5 gives you a replacement for the “back” easing in other libraries, with the benefit of tuning. Frequencies that are not multiples of 1/2 tend to look bad, but thanks to the decay function they still end up at 1 no matter what.

UNIFORM

This is one of the most useful ones, and something like it is lacking everywhere I looked. In a lot of situations, it is desirable to have a “mostly linear” movement, with a steady speed in the middle of it. The biggest problem with linear interpolation is the ending points. Having the object static and suddenly starting to move looks jarring and unrealistic.

The “uniform” easing I came up with is a way of keeping the best of both worlds: you can tune how much of the path will be linear, and how much of the remaining will be used by acceleration/deceleration. You can also tune how aggressive acceleration/deceleration will be.

Due to its almost-linear nature, it works exceptionally well with other easing functions. This is shown in the last one (bottom right), where I used it along with the bounce function to give it an extra anticipation in both ends. It makes the bounce feel heavier. Looks pretty good!

Can you release these functions somewhere?

I will write a detailed post about each of them along with pseudocode if there’s enough interest. Since these functions aren’t meant to be used in real time applications, they are not ready to be used in a lot of contexts out there with a lot of moving objects. It would be pretty easy to cache these and make it super fast during run time, though.

However, most people seem to be happy enough with their easing libraries, so I’m not sure if it’s worth the trouble, nor if tumblr is the best way to go about it.

So if you are interested, please drop me a request so I know I won’t be wasting time posting them here.

3D Interactive Skeleton Reference!

Sat, 16 Mar 2013 00:59:05 +0000

3D Interactive Skeleton Reference!:

paperseverywhere:

kisskicker:

pinksparkledogs:

SO I haven’t seen anyone post this yet and I thought it was just too useful not to share….

3D Interactive Skeleton Reference!

Brought to you by Kineman.com!

No more looking endlessly for hundreds of refs! Well…you should still look for several refs but at least this should clear up any sort of issues you may have when drawing a skeleton from a strange angle, or can’t quite see that scapula.

Basically, this reference is totally 3D rendered from a very average looking specimen. Each joint has a horizontal and vertical axis to be moved on, so you can endlessly pose your skeleton. You can also zoom and change the angle giving you all the impossible angles you thought you’d never be able to see. HOW FUN! There is also a neat “cut away” feature which will slice your skeleton at various angles, neat for drawing busted up skeletons, or seeing the inside of the skull.

or put your skeleton in excruciating pain

Anyway, have fun with it!

THIS IS SO AMAZING

YES!!

Ooooo

Photo

Fri, 15 Mar 2013 11:36:32 +0000

bjornsblog: This is the music video I’ve been dying to show for...

Sun, 10 Mar 2013 01:42:16 +0000

bjornsblog:

This is the music video I’ve been dying to show for a while now. Directed and animated by Timothy McCourt and Wesley Louis I’m proud to have been art directing this with a small team of excellent animators and designers for the last few months! This will be marking the launch of our new animation collective THE LINE! http://followtheline.co.uk

Woop woop, new collective in East London yeah.

marcedith: …NO.5 by ~TAIYANGGUODU…

Sun, 10 Mar 2013 01:28:57 +0000

marcedith:

…NO.5 by ~TAIYANGGUODU…

Photo

Tue, 05 Feb 2013 17:16:21 +0000

ca-tsuka: Image-boards and artworks by Christophe Ferreira for...

Tue, 05 Feb 2013 17:15:01 +0000

ca-tsuka:

Image-boards and artworks by Christophe Ferreira for “Buta” french/japanese feature film project (also called “Kistune”).
A pilot was produced by Telecom studio, with Kazuhide Tomonaga as animation director.

FRENDEN: The Yiynova MSP19U Cintiq Alternative Swings for the Fences

Fri, 01 Feb 2013 12:00:02 +0000

FRENDEN: The Yiynova MSP19U Cintiq Alternative Swings for the Fences :

frenden:

With the release of their second generation budget Cintiq alternative, Yiynova gets it right

Yiynova took on Wacom’s tablet display monopoly last year with their release of the DP10 and MSP19. I reviewed those units and they left me wanting.

The Yiynova used Waltop digitizers…

bjornsblog: This is a birthday card from last year to my mate...

Tue, 22 Jan 2013 09:59:22 +0000

bjornsblog:

This is a birthday card from last year to my mate Sam, who I’m working with on a our short film EVERYTHING I CAN SEE FROM HERE. Our project did not get any smaller since then. Come to our screening! http://www.facebook.com/events/324021061032898/

Photo

Mon, 21 Jan 2013 11:53:10 +0000

:3

Sat, 08 Dec 2012 16:16:58 +0000

potassium-iodide: I’m sure this is on tumblr somewhere. Refs.

Mon, 26 Nov 2012 14:27:52 +0000

potassium-iodide:

I’m sure this is on tumblr somewhere. Refs.

ledazblog: I may have a problem halp. Welcome to being human.

Mon, 26 Nov 2012 14:25:51 +0000

ledazblog:

I may have a problem halp.

Welcome to being human.

turbomurderhobo: stephenmccranie: This essay is kind of the...

Sat, 13 Oct 2012 08:45:06 +0100

turbomurderhobo:

stephenmccranie:

This essay is kind of the second part of an essay on taste that can be read here:

http://doodlealley.com/2012/10/01/taste-is-your-teacher/

Beautifully put

I believe there’s a pretty good TED talk about this :V Embracing failure I think

Good Morning Muscat!Specifically, the somewhat suburban district...

Thu, 11 Oct 2012 18:03:39 +0100

Good Morning Muscat!

Specifically, the somewhat suburban district of Al Khoot.

whoneedsstyleanyway: A quick fanny around with some...

Sun, 30 Sep 2012 00:00:41 +0100

whoneedsstyleanyway:

A quick fanny around with some brushes.

Any details on those brushes?

Oh and nice drawing you dirty bugger

Now this’s my kinda’ animation.

Tue, 25 Sep 2012 19:32:23 +0100

Now this’s my kinda’ animation.

Ernest et CélestineOh man this’s some nice animation.

Mon, 24 Sep 2012 03:10:56 +0100

Ernest et Célestine

Oh man this’s some nice animation.

ryan-a: Here’s a little making-of my Yakuza illustration for...

Fri, 14 Sep 2012 02:48:37 +0100

Start with an idea and a loose sketch!

This is what it looks like with those layers applied over the illustration

Add the tattoos, adjust the levels, and I'm done!

ryan-a:

Here’s a little making-of my Yakuza illustration for the exhibition, Battles without Honor and Humanity, at Floating World Comics in Portland Oregon on September 16.