Christopher Overstreet

I am trying to draw graphics on a 2D plane in front of a 3D rendered world. Just like in video games. I would like this control panel to be able to slide in and out, control alpha, etc. but not be effected by the camera perspective of the underlying world. I thought that a jit.gl.videoplane object with ortho 1 would work, but it doesn't. How does one do this?

I am trying to draw graphics on a 2D plane in front of a 3D rendered world.  Just like in video games.  I would like this control panel to be able to slide in and out, control alpha, etc. but not be effected by the camera perspective of the underlying world.  I thought that a jit.gl.videoplane object with ortho 1 would work, but it doesn't.  How does one do this?

ortho1-overlayed-ortho0

@ortho is a renderer setting. So you will need to disable automatic 

mode, send ortho X to jit.gl.render, bang the objects you wish to 

draw, then send @ortho Y to jit.gl.render and bang the other objects 

@ortho is a renderer setting. So you will need to disable automatic  
mode, send ortho X to jit.gl.render, bang the objects you wish to  
draw, then send @ortho Y to jit.gl.render and bang the other objects  
you wish to draw.

I am also rendering multiple view onto a single context using multiple

But I receive a flikering screen, how could we enable double-buffering and

swap buffer manually after all rendering finish ?

I am also rendering multiple view onto a single context using multiple
bangs.
But I receive a flikering screen, how could we enable double-buffering and
swap buffer manually after all rendering finish ?


you can't "bang" jit.gl.render multiple times for a single frame. 

jit.gl.render's "bang" method is equivalent to drawclients, swap. You 

can just swap with the message "swap". In my message I was suggesting 

sending the "bang" message to the jit.gl.objects being drawn. For 

these, bang is equivalent to the "draw" message. You will want to 

turn the jit.gl objects' automatic attribute off.

you can't "bang" jit.gl.render multiple times for a single frame.  
jit.gl.render's "bang" method is equivalent to drawclients, swap. You  
can just swap with the message "swap". In my message I was suggesting  
sending the "bang" message to the jit.gl.objects being drawn. For  
these, bang is equivalent to the "draw" message. You will want to  
turn the jit.gl objects' automatic attribute off.

So I tried what you suggested, which is attached, but when I change the camera to jit.gl.render in anything but the z-axis the ortho 2 layer is still effected. Did I misinterpret your suggestion?

So I tried what you suggested, which is attached, but when I change the camera to jit.gl.render in anything but the z-axis the ortho 2 layer is still effected.  Did I misinterpret your suggestion?

On Feb 21, 2006, at 10:23 AM, Christopher Overstreet wrote:

> So I tried what you suggested, which is attached, but when I change 

> the camera to jit.gl.render in anything but the z-axis the ortho 2 

> layer is still effected. Did I misinterpret your suggestion?

You simply need to set the camera position for each "layer"--i.e. 

>
> So I tried what you suggested, which is attached, but when I change  
> the camera to jit.gl.render in anything but the z-axis the ortho 2  
> layer is still effected.  Did I misinterpret your suggestion?

You simply need to set the camera position for each "layer"--i.e.  
something like the following sequence

erase
ortho 2
camera 
bang layer 1 objects
ortho 0
camera 
bang layer 2 objects
bang or "swap" message to jit.gl.render

ortho1 overlayed ortho0?