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Chris Perren

I am a relative beginner to Max, first time posting on the forum. Thanks in advance for any assistance. 

I am creating a video tool which displays 12 instances of the same video across a single screen, with each video playing at a different speed. 

To make this happen, I've arrived at a setup where I have 12 jit.gl.movie objects, feeding into 12 jit.gl.videoplane objects, writing to a single jit.world.

I have made parameters to spread the videos spatially (i.e. evenly distribute) across 

For the most part, this all works ok. The videos all show up fine and the spatial distribution works. 

The issue I am having is with what seems to be a kind of grouping or chunking behaviour in the way that the multiple videos are rendered. For example: 

When the videos are overlapping on the x plane, I would expect them to all overlap in the same direction (like fanning cards), but they seem to overlap randomly. To get them to fan out like cards, I have to put a non-zero value into the 

 spread, so that they're actually in order in front of one another in space.

I can live with that workaround, however, the next issue (which feels related to me) occurs when I use blending. For example, when I set all my jit.gl.videoplane Blend Enable attributes to 'ON', and Blend attributes to 'add', I get this:

I'm not sure if I have misunderstood something, but I would expect the additive blending effect to compound across all videos. To me this looks like the first four videos from the left are additively blending, but then the four in the middle are normal, then a bit more additive blending in the last four panels but not in the way I would expect.

Does anyone have an explanation for what might cause the jit.gl.videoplane objects to display this way? Or whether there's a way to force them to render in a particular order, or to blend globally?

I think it probably isn't important, but just in case it is, I have a jit.gl.slab in between each of the jit.gl.movie/jit.gl.videoplane pairs, running the shader 'cc.brcosa.jxs'.  

Hi friends, 

I am a relative beginner to Max, first time posting on the forum. Thanks in advance for any assistance. 

I am creating a...

order-of-rendering-multiple-jitglvideoplane-objects

Order of rendering multiple jit.gl.videoplane objects

James Harkins

There is something (well, probably a lot of things) that I don't understand about alpha blending in 

 and rgb2luma it to replace the original alpha. A jit.alphablend proves to me that the alpha is being calculated and processed correctly.

Then I pass the alpha-ized matrices into 

.gridshape correctly renders the RGB planes if @blend_enable is off.

I've got a green background at 0, 0, -0.1, and the texture is being applied to a 

.gridshape (plane) at 0, 0, 0. What I thought would happen when I enable blending is that the green background would shine through the low alpha areas. That is, if the texture makes parts of the shape transparent, shouldn't you be able to see through that to whatever is behind?

Instead I saw a couple of different behaviors: either the gridshape simply disappears (which I'd say could be like the alpha channel is being treated as all 0, but, can't see why), or it turns gray and doesn't show the texture at all.

I tried several different blend modes but none of them do, well, 

. I got a whole bunch of weird gray scale manipulations but nothing intuitive.

I'll admit here to not being confident in OpenGL basic concepts (I'm an audio guy, poor visual arts sense, 

 a graphics specialist at all), but, when I used transparent textures in Pd+Gem, I could just see right through the object as one would expect. So clearly OpenGL can do it, just not with the default settings in Max.

There is something (well, probably a lot of things) that I don't understand about alpha blending in jit.gl.*.

I read in traffic.mov and...

jitgl-textures-transparency

jit.gl, textures, transparency

Diemo Schwarz

Hi, I'm new to jit physics and managed a first mass–spring model, but would like to change the speed of the movements dynamically (but keep the same frame rate). I tried fixedtimestep, but this is not changing the simulation time step.

 from a metro, because I don't need any rendering, just the physics.  Slowing the metro slows the movement, of course, but makes it choppy.

Hi, I'm new to jit physics and managed a first mass–spring model, but would like to change the speed of the movements dynamically (but keep...

jitphysworld-global-simulation-time-step-speed-change

jit.phys.world global simulation time step / speed change

Connector

I have a jitter patch with webcam input and output to two windows. Inside the patch i want to switch the visibility of two jit.gl.videoplanes through the @layer attribute. 

In my first window "windowLeft" it works fine, but at the second window "windowRight" switching between the videoplanes does not work. Maybe i am missing an some attribute?

wahrnehmungTEST.maxpat

Problem with switching visibility between videoplanes through @layer attribute

problem-with-switching-visibility-between-videoplanes-through-layer-attribute

I've been (once again) embarrassed by lack of understanding of mesh coloring.

I'm aware of this: "Planes 0-2 specify the x, y and z position of the vertex. Planes 3 and 4 specify the texture co-ordinates s and t. Planes 5-7 specify the normal vector nx, ny and nz used to calculate the effects of lighting on the geometry. Planes 8-11 specify the red, green, blue, and alpha vertex color. Plane 12 specifies the edge flag e."

OK, so I do a jit.unpack and put planes 8-11 (counting from 0) into a jit.pack 4, and put that into the color array input of 

.mesh. I get: black. jit.cellblock shows me that this color array is actually 0.5 0.5 0.5 1.0, but 

I've tried putting the rest of the matrix output into the other 

.mesh inputs, but the only thing that will ever draw colors for me is auto_color 1. But I don't want auto_color; I want to control the color.

Hi,

I've been (once again) embarrassed by lack of understanding of mesh coloring.

I'm aware of this: "Planes 0-2 specify the x, y and z...

jitglmesh-thinks-every-color-is-black

jit.gl.mesh thinks every color is black

I am trying to use a texture inside a shader but I have two different Problems with that. 

wahninhalteDev.maxpat

RectShader.jxs

At first i have a matrix where i import a PNG file with transparency inside. When i use this texture inside a shader transparency does not work correctly: 

The second point is: Insede the shader i am using this code to draw the rectangles with the texture: 

	void main() {
			
			vec2 p0 = toScreenSpace( gl_in[0].gl_Position );
			vec2 p1 = toScreenSpace( gl_in[1].gl_Position );
			vec2 v0 = normalize( p1 - p0 );
			vec2 n0 = vec2( -v0.y, v0.x ) * 30.86; 
		
			gl_Position = toWorldSpace(vec4( ( p0 + n0 ), gl_in[0].gl_Position.zw ));
			color = jit_in[0].color;
            texcoord0 = vec2(0., 0.);
			
			EmitVertex();
			gl_Position = toWorldSpace(vec4( ( p0 - n0 ), gl_in[0].gl_Position.zw ));
			color = jit_in[0].color; 
            texcoord0 = vec2(0., 1.);
			
			EmitVertex();
			gl_Position = toWorldSpace(vec4( ( p1 + n0 ), gl_in[1].gl_Position.zw ));
			color = jit_in[1].color; 
			texcoord0 = vec2(1., 0.);
            
			EmitVertex();
			gl_Position = toWorldSpace(vec4( ( p1 - n0 ), gl_in[1].gl_Position.zw ));
			color = jit_in[1].color; 
			texcoord0 = vec2(1., 1.);
            
			EmitVertex();
			EndPrimitive();
			
		}	

Jitter Forum