I'm currently trying to get the hang of javascript with jitter, but 

I've hit a bit of a snag. I'm trying to recreate Andrew's Jitter 

Recipe 12: Texture Distortion in js. I need to be able to grab the 

output matrix of a jit.gl.gridshape object in matrixoutput mode. 1) 

How do I do this? and 2) Is it necessary to declare a render 

destination if the gridshape is only used in matrixoutput mode?

var myShape = new JitterObject("jit.gl.gridshape"); //Render 

var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);

    myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the right 

    outlet(0, "jit_matrix", shapeMatrix.name);

I'm currently trying to get the hang of javascript with jitter, but  
I've hit a bit of a snag.  I'm trying to recreate Andrew's Jitter  
Recipe 12: Texture Distortion in js.  I need to be able to grab the  
output matrix of a jit.gl.gridshape object in matrixoutput mode.  1)  
How do I do this? and 2) Is it necessary to declare a render  
destination if the gridshape is only used in matrixoutput mode?

var  myShape = new JitterObject("jit.gl.gridshape");  //Render  
destination necessary?
	myShape.shape = "plane";
	myShape.dim = [2, 2];
	myShape.matrixoutput = 1;
var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);

function bang() {
	myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the right  
method call?
	outlet(0, "jit_matrix", shapeMatrix.name);
}

how-to-get-matrixoutput-from-jit-gl-gridshape

I don't think you can grab the matrixoutput in JS since that is part

of the maxwrapper which JS has no access to. JS Jitter objects simply

reference the bare Jitter object (this will make more sense if you

have ever done any Jitter C dev or have read related docs. It might

even be mentioned in the JSJitter docs). Anyway, there have been

threads on this topic before and I believe the conclusion was it's

simply not possible due to the lack of outlet knowledge in JS.

As an alternative, gridshapes can be easily built with jit.expr

expressions. In fact the name jit.gl.gridshape comes from the mapping

of the vertex data to a grid aka a matrix and the simple expressions

used to generate the corresponding geometry.

On Dec 30, 2007 12:14 AM, Jack Phillips wrote:

> I'm currently trying to get the hang of javascript with jitter, but

> I've hit a bit of a snag. I'm trying to recreate Andrew's Jitter

> Recipe 12: Texture Distortion in js. I need to be able to grab the

> output matrix of a jit.gl.gridshape object in matrixoutput mode. 1)

> How do I do this? and 2) Is it necessary to declare a render

> destination if the gridshape is only used in matrixoutput mode?

> var myShape = new JitterObject("jit.gl.gridshape"); //Render

> var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);

> myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the right

> outlet(0, "jit_matrix", shapeMatrix.name);

I don't think you can grab the matrixoutput in JS since that is part
of the maxwrapper which JS has no access to.  JS Jitter objects simply
reference the bare Jitter object (this will make more sense if you
have ever done any Jitter C dev or have read related docs.  It might
even be mentioned in the JSJitter docs).  Anyway, there have been
threads on this topic before and I believe the conclusion was it's
simply not possible due to the lack of outlet knowledge in JS.

As an alternative, gridshapes can be easily built with jit.expr
expressions.  In fact the name jit.gl.gridshape comes from the mapping
of the vertex data to a grid aka a matrix and the simple expressions
used to generate the corresponding geometry.

On Dec 30, 2007 12:14 AM, Jack Phillips  wrote:
> Hi list,
>
> I'm currently trying to get the hang of javascript with jitter, but
> I've hit a bit of a snag.  I'm trying to recreate Andrew's Jitter
> Recipe 12: Texture Distortion in js.  I need to be able to grab the
> output matrix of a jit.gl.gridshape object in matrixoutput mode.  1)
> How do I do this? and 2) Is it necessary to declare a render
> destination if the gridshape is only used in matrixoutput mode?
>
> Here's the relevant code:
>
> var  myShape = new JitterObject("jit.gl.gridshape");  //Render
> destination necessary?
>         myShape.shape = "plane";
>         myShape.dim = [2, 2];
>         myShape.matrixoutput = 1;
> var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);
>
> function bang() {
>         myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the right
> method call?
>         outlet(0, "jit_matrix", shapeMatrix.name);
> }
>
> Thanks for any insights.
>
>


I think if you use JitterListener with a jit.gl object with 

@matrixoutput 1 you can get access to the matrix output in javascript. 

Should work but long time since I tested this.

On Dec 29, 2007, at 10:21 PM, "Wesley Smith" 

> I don't think you can grab the matrixoutput in JS since that is part

> of the maxwrapper which JS has no access to. JS Jitter objects simply

> reference the bare Jitter object (this will make more sense if you

> have ever done any Jitter C dev or have read related docs. It might

> even be mentioned in the JSJitter docs). Anyway, there have been

> threads on this topic before and I believe the conclusion was it's

> simply not possible due to the lack of outlet knowledge in JS.

> As an alternative, gridshapes can be easily built with jit.expr

> expressions. In fact the name jit.gl.gridshape comes from the mapping

> of the vertex data to a grid aka a matrix and the simple expressions

> used to generate the corresponding geometry.

> On Dec 30, 2007 12:14 AM, Jack Phillips 

>> I'm currently trying to get the hang of javascript with jitter, but

>> I've hit a bit of a snag. I'm trying to recreate Andrew's Jitter

>> Recipe 12: Texture Distortion in js. I need to be able to grab the

>> output matrix of a jit.gl.gridshape object in matrixoutput mode. 1)

>> How do I do this? and 2) Is it necessary to declare a render

>> destination if the gridshape is only used in matrixoutput mode?

>> var myShape = new JitterObject("jit.gl.gridshape"); //Render

>> var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);

>> myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the 

>> outlet(0, "jit_matrix", shapeMatrix.name);

I think if you use JitterListener with a jit.gl object with  
@matrixoutput 1 you can get access to the matrix output in javascript.  
Should work but long time since I tested this.

On Dec 29, 2007, at 10:21 PM, "Wesley Smith"   
wrote:

> I don't think you can grab the matrixoutput in JS since that is part
> of the maxwrapper which JS has no access to.  JS Jitter objects simply
> reference the bare Jitter object (this will make more sense if you
> have ever done any Jitter C dev or have read related docs.  It might
> even be mentioned in the JSJitter docs).  Anyway, there have been
> threads on this topic before and I believe the conclusion was it's
> simply not possible due to the lack of outlet knowledge in JS.
>
> As an alternative, gridshapes can be easily built with jit.expr
> expressions.  In fact the name jit.gl.gridshape comes from the mapping
> of the vertex data to a grid aka a matrix and the simple expressions
> used to generate the corresponding geometry.
>
> best,
> wes
>
> On Dec 30, 2007 12:14 AM, Jack Phillips   
> wrote:
>> Hi list,
>>
>> I'm currently trying to get the hang of javascript with jitter, but
>> I've hit a bit of a snag.  I'm trying to recreate Andrew's Jitter
>> Recipe 12: Texture Distortion in js.  I need to be able to grab the
>> output matrix of a jit.gl.gridshape object in matrixoutput mode.  1)
>> How do I do this? and 2) Is it necessary to declare a render
>> destination if the gridshape is only used in matrixoutput mode?
>>
>> Here's the relevant code:
>>
>> var  myShape = new JitterObject("jit.gl.gridshape");  //Render
>> destination necessary?
>>        myShape.shape = "plane";
>>        myShape.dim = [2, 2];
>>        myShape.matrixoutput = 1;
>> var shapeMatrix = new JitterMatrix(3, "float32", 2, 2);
>>
>> function bang() {
>>        myShape.matrixcalc(shapeMatrix, shapeMatrix) //What's the  
>> right
>> method call?
>>        outlet(0, "jit_matrix", shapeMatrix.name);
>> }
>>
>> Thanks for any insights.
>>
>>


How to get matrixoutput from jit.gl.gridshape