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Darwin Grosse

Gregory Taylor

Welcome back to the second portion of our patch on the mysteries and wonders of the Spirograph. This time out, we are going to augment our Spirograph patch by using the Jitter 

 object will let us make use of the drawing modes that the object supports to create even more interesting output from the Jitter matrix of values the Javascript code creates.

SPIROGRAPHICS_PART2.zip

Let's start by making a comparison between the Spirograph patch Darwin created last time and the

 version of the patch. Here is the original from 

image.png

 patch together with the display window it uses rather than the in-patch 

You may be surprised to discover how little this patcher varies from what we created for the 

-based patch. Apart from some obvious differences related to using the standard 

 approach to visualizing our mesh, the input routings are precisely the same. The largest difference is that we've replaced the original 

) that will perform the calculations we need for our 

-based rendering, and demonstrates a few of the new things we can add to our patch visualization:

As with the parent patch, there's not a lot of change, and what change there 

 relates to the fact that this subpatcher is writing its results to a Jitter matrix, which the 

 object that will contain the data used for rendering is a matrix of 64-bit floating-point values whose dimensions will vary according to the number of points we want to render (we've set a default value using arguments, and we can reset those dimensions any time the number of render points changes in the parent patch using a 

 object (by means of the addition of a second patchcord from the fourth outlet of the 

Here's one thing that hasn't changed at all — we're using 

 object we used in the previous patch. The 

output and reformat it to a matrix whose dimensions are automatically set depending on the number of points we want to plot. If you’re being observant, you may have noticed that our 

 dimensions rather than two. Does that mean we're thinking ahead to a 3D version of our patch? Yes, it does. Read on....

 object’s output and formatting it as a matrix:

As before, you will recognize the use of the 

 object to process incoming messages based on their first argument:

Remember how you noticed a bit earlier that we were working with a 3D jit.matrix object? A quick second look at the code in the

 object will verify that we’re not doing any calculations for a third (

) setting that would give us 3D output; when we construct the output to our

 subpatcher, we’re simply always writing a value of zero for the 

 coordinate values. So now it's time to do something with that 

 value and step into the third dimension!

It's not all that much different from the 

 patch, but the output sure looks different!

You'll notice that this patch adds a new 

 object that formats the list to send to the 

 subpatcher. Let's look inside that subpatcher to check out the changes in the patching there:

In order to do work in three dimensions. we’re going to need to modify our Javascript code to handle calculating 3D output. You’ll find that new code inside the 

 object. Let’s look at the changes we’ve made to enable 3D rendering and walk through them:

We’ve added a single new global variable (

// global variables
var largeRad = .70;
var smallRad = .15;
var smallRatio = 30;
var renderpts = 1000;
var renderstep = TWOPI / renderpts;
var depthscale = .1;

 function is where you’ll notice the big changes. The function now includes a third variable (

) to define the starting point values, which is calculated and stored as we iterate through our calculations.

// the bang function renders the current settings into a set
// of vector locations in the ranges of -1.0 thru 1.0
function bang() {
    var x, y;            // calculated dimensions
    var tmp, theta;            // variables for drawing calcs
    var stx, sty, stz;        // variables containing the starting points
    var started = 0;        // 'first time' flag

The biggest change in the code involves the way we calculate a 

 coordinate based on the variables we’re already calculating. We’re taking the 

 variables, and then modifying that result and scaling the output to a range of -1. to 1. (which is what we’re using for the 

for (theta=0; theta<TWOPI; theta+=renderstep) {
    // calculate the drawing position
    tmp = theta * smallRatio;
    x = largeRad * Math.cos(theta) + smallRad * Math.cos(tmp);
        y = largeRad * Math.sin(theta) + smallRad * Math.sin(tmp);
    
        z = Math.abs((tmp % 2) - 1);    // reduce to 0 - 1, rotate around 0
    z = Math.abs(z - .5);        // rotate around 0
    z = (z - .25) * 4;        // scale to -1 - 1
        
    z *= depthscale;        // do depth scaling

// set the depth scaler
function setDepthScale(v) {
    if ((v < 1.0) && (v > 0.0)) {
        depthscale = v;
    }

And finally, we now output a 5-item message, whose 5th item is the 

    // send out the end message along with the
    // original start point (to complete the drawing)
    outlet(0, 'end', stx, sty, stz);

Having made those changes in our Javascript, all we need to do is to modify the 

 message sent for each point in the calculation – the only change is the 

With that change added, we're ready to roll. As before it's a lot of fun to try different settings. And since we're working with OpenGL, there are lots of interesting drawing modes to investigate. Here are just a few examples:

Once you have a setting you like, be sure to use the 

 features to click and drag to explore your results in 3D!

Of course, there are still interesting places we can go with this patch as a starting point — for example, you might consider coming up with your own approach to calculating an offset value for the 

 coordinate that makes use of the variables we’re already calculated in the Javascript.

But I'll leave you with my own "next step" — working with 

 copies of the 3D patch to create a crossfadable mesh pair. It's really not difficult to do, given that our original 

 patch sends a standard Jitter matrix to the

 object is tailor-made for things like this: you give it two matrices and a floating-point value between zero and one, and it will interpolate between both sets of data and output the result. In the case of our patch, that output will be a "morph" between two Spirograph drawings. Here's the 

 patch in the midst of just such a crossfade:

However, there is one thing we'll need to take into account: Our original 3D mesh patch outputs a single Jitter matrix each time we change one of its input parameters rather than being connected to some patching that regularly sends 

 messages. We're going to have to add some logic to handle generating new crossfade output each time either of the two matrices is updated, and we'll need to add some logic to trigger our output if we manually modify the crossfade value itself. The 

 subpatcher takes care of all of those situations using our old friend the 

All we need to do is to attach a multislider to the 

 subpatcher's left inlet and connect up the two outlets from each of the 

 subpatchers to the middle and right-hand inlets of the 

 subpatcher we borrowed from one of the original 

 patches. The results speak for themselves....

Here’s a short video that demonstrates the 3D spirograph from Part II of the Spirograpy tutorial n action. It demonstrates the drawing modes and the ability to morph between two different Spriograph drawings.

3D Morphing Spirographs

Thanks for following along, and we hope you enjoy this bit of patching. If you add any features of your own, feel free to share your results in the comments area.

Welcome back to the second portion of our patch on the mysteries and wonders of the Spirograph. This time out, we are going to augment our Spirograph patch by using the Jitter jit.gl.mesh object rather than jit.lcd. Using the jit.gl.mesh object will let us make use of the drawing modes that the object supports to create even more interesting output from the Jitter matrix of values the Javascript code creates.

Let's start by making a comparison between the Spirograph patch Darwin created last time and the jit.gl.mesh version of the patch. Here is the original from Part I of the tutorial:

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