nesa

I just wanted to send one big THANK YOU to all of you posting great 

patches recently, especially Andreas, Andrew, Dan Winckler, Joshua 

(Fried Banana) Clayton, vade, Wesley and yair!

I just wanted to send one big THANK YOU to all of you posting great  
patches recently, especially Andreas, Andrew, Dan Winckler,  Joshua  
(Fried Banana) Clayton, vade, Wesley and yair!


big-thanks

You're welcome! :) thanks for the thank you.

Incidentally, I'm trying to replicate the pool.pat example with shaders. Xray.jit.water is great but fairly expensive in CPU cycles. I'll post it if I'm successful.

You're welcome! :) thanks for the thank you. 

Incidentally, I'm trying to replicate the pool.pat example with shaders. Xray.jit.water is great but fairly expensive in CPU cycles. I'll post it if I'm successful. 

Here's the main loop from xray.jit.water. prev is the previous matrix

in time. Essentially there's a spatial weighting of the neighboring 8

cells and a temporal weighting with the previous value in the location

being calculated. It should be straightforward to implement as a

shader which would be a cross of convolve and slide since it needs

        height = prev_minfo->dim[1];

        incolspan = in1_minfo->dimstride[0];

        inrowspan = in1_minfo->dimstride[1];

        outcolspan = out_minfo->dimstride[0];

        outrowspan = out_minfo->dimstride[1];

        prevcolspan = prev_minfo->dimstride[0];

        prevrowspan = prev_minfo->dimstride[1];

        if (in1_minfo->type==_jit_sym_float32) {

            timestep = x->timestep;

            damping = x->damping;

            timeSpaceFactor = (timestep*timestep)/(x->spacestep*x->spacestep);

            dampFactor = 1 - damping*timestep;

            for(i=1; i < height-1; i++) {

                fip1_up = (float *)(bip1 + (i-1)*inrowspan);

                fip1 = (float *)(bip1 + i*inrowspan);

                fip1_down = (float *)(bip1 + (i+1)*inrowspan);

                fip2 = (float *)(bip2 + i*inrowspan);

                prev_fp = (float *)(prev_bp + i*prevrowspan);

                fop = (float *)(bop + i*outrowspan);

                for(j=1; j < width-1; j++) {

                    fop[j] = fip1[j] + dampFactor*(fip1[j] - prev_fp[j] )

                        - timeSpaceFactor*fip2[j]*(4*fip1[j] - fip1[j-1] - fip1[j+1] -

                        + 0.5*(4*fip1[j] - fip1_up[j-1] - fip1_up[j+1] - fip1_down[j-1]

                    CLIP(fop[j], -1, 1);

Here's the main loop from xray.jit.water.  prev is the previous matrix
in time.  Essentially there's a spatial weighting of the neighboring 8
cells and a temporal weighting with the previous value in the location
being calculated.  It should be straightforward to implement as a
shader which would be a cross of convolve and slide since it needs
temporal feedback and spatial weighting.

width  = prev_minfo->dim[0];
		height = prev_minfo->dim[1];

		incolspan = in1_minfo->dimstride[0];
		inrowspan = in1_minfo->dimstride[1];
		outcolspan = out_minfo->dimstride[0];
		outrowspan = out_minfo->dimstride[1];
		prevcolspan = prev_minfo->dimstride[0];
		prevrowspan = prev_minfo->dimstride[1];

		if (in1_minfo->type==_jit_sym_float32) {
			timestep = x->timestep;
			damping = x->damping;
			timeSpaceFactor = (timestep*timestep)/(x->spacestep*x->spacestep);
			dampFactor = 1 - damping*timestep;

			for(i=1; i < height-1; i++) {
				fip1_up = (float *)(bip1 + (i-1)*inrowspan);
				fip1 = (float *)(bip1 + i*inrowspan);
				fip1_down = (float *)(bip1 + (i+1)*inrowspan);
				fip2 = (float *)(bip2 + i*inrowspan);

				prev_fp = (float *)(prev_bp + i*prevrowspan);
				fop = (float *)(bop + i*outrowspan);

				for(j=1; j < width-1; j++) {
					fop[j] = fip1[j] + dampFactor*(fip1[j] - prev_fp[j] )
						- timeSpaceFactor*fip2[j]*(4*fip1[j] - fip1[j-1] - fip1[j+1] -
fip1_up[j] - fip1_down[j]
						+ 0.5*(4*fip1[j] - fip1_up[j-1] - fip1_up[j+1] - fip1_down[j-1]
- fip1_down[j+1] ));

					CLIP(fop[j], -1, 1);
				}
			}
		}


Also, you will probably need float textures since 256 steps from [-1,

Also, you will probably need float textures since 256 steps from [-1,
1] will not be so great looking.

Wow, thanks, Wes! :D I'll get right on this.

Wow, thanks, Wes!  :D  I'll get right on this.


> I just wanted to send one big THANK YOU to all of you posting great 

> patches recently, especially Andreas, Andrew, Dan Winckler, Joshua 

> (Fried Banana) Clayton, vade, Wesley and yair!

Thank *you* for doing the same, nesa. And thanks for alphabetizing us!

These last couple of weeks have been amazing on the jitter list, I quite 

agree - nothing like pillaging through the work of others - I guess 

there are still some viking genes left in me!

(working w. boids now, thanks to sage advice from Wesley :-) )

nesa skrev:
> Hello dear people@maxlist,
>
> I just wanted to send one big THANK YOU to all of you posting great 
> patches recently, especially Andreas, Andrew, Dan Winckler,  Joshua 
> (Fried Banana) Clayton, vade, Wesley and yair!
Thank *you* for doing the same, nesa. And thanks for alphabetizing us!

These last couple of weeks have been amazing on the jitter list, I quite 
agree - nothing like pillaging through the work of others - I guess 
there are still some viking genes left in me!

Andreas
(working w. boids now, thanks to sage advice from Wesley :-)  )


Your welcome! I'm really stoked about the level of sharing and 

encouragement that this forum has been generating lately.

Your welcome!  I'm really stoked about the level of sharing and 
encouragement that this forum has been generating lately.

On Sep 16, 2007, at 1:19 AM, Andreas Wetterberg wrote:

> (working w. boids now, thanks to sage advice from Wesley :-) )

That sounds like a good ingredient for a recipe:

Put five fresh jit.boids in a fresh xray.jit.water, quickly bringing 

I've been playing with convolution+feedback lately, and I'm totally 

hooked. Here are two lq clips, one recorded using Wesley's 'depth 

artifacts' patch with some standard slabs added:

and one failed attempt to make a water-like effect:

http://www.ruccas.org/pub/nesa/retro%20flow-17k.mov

made using this patch(which didn't have the same results on xp):

>
> Andreas
> (working w. boids now, thanks to sage advice from Wesley :-)  )

Put five fresh jit.boids in a fresh xray.jit.water, quickly bringing  
cpu to the boil...

I've been playing with convolution+feedback lately, and I'm totally  
hooked. Here are two lq clips, one recorded using Wesley's 'depth  
artifacts' patch with some standard slabs added:

big thanks