een4djb@leeds.ac.uk

I have been using opengl to draw a 3d graph in real time of some positional data. what i want to do is layer some transparent 2d graphs or drawings ontop of the 3d graph. I am using blend to create the transparency but i cant seem to work out how to draw 2d images on top of 3d.

the 3d graph is drawn using jit.gl.gridshape and uses handle + camera positions to navigate around it. automatic is set off for all the objects so i can control the drawing order...

I have been using opengl to draw a 3d graph in real time of some positional data.  what i want to do is layer some transparent 2d graphs or drawings ontop of the 3d graph.  I am using blend to create the transparency but i cant seem to work out how to draw 2d images on top of 3d.

the 3d graph is drawn using jit.gl.gridshape and uses handle + camera positions to navigate around it.  automatic is set off for all the objects so i can control the drawing order...

2d-on-top-of-3d

https://cycling74.com/forums/index.php?t=msg&goto=66889

On Thu, Jul 31, 2008 at 12:25 PM, David Bradshaw wrote:

> I have been using opengl to draw a 3d graph in real time of some positional

> data. what i want to do is layer some transparent 2d graphs or drawings

> ontop of the 3d graph. I am using blend to create the transparency but i

> cant seem to work out how to draw 2d images on top of 3d.

> the 3d graph is drawn using jit.gl.gridshape and uses handle + camera

> positions to navigate around it. automatic is set off for all the objects

a start,
https://cycling74.com/forums/index.php?t=msg&goto=66889

>
> I have been using opengl to draw a 3d graph in real time of some positional
> data.  what i want to do is layer some transparent 2d graphs or drawings
> ontop of the 3d graph.  I am using blend to create the transparency but i
> cant seem to work out how to draw 2d images on top of 3d.
>
> the 3d graph is drawn using jit.gl.gridshape and uses handle + camera
> positions to navigate around it.  automatic is set off for all the objects
> so i can control the drawing order...
>
> any ideas?
>
> thanks
>
> david
>
>
>

Cheers, that does the trick but it seems to be very expensive, presumably due to constantly changing viewing angles. any ideas how i could speed it up

Cheers, that does the trick but it seems to be very expensive, presumably due to constantly changing viewing angles.  any ideas how i could speed it up
?

no, it ok to change viewing angle, a patch?

On Thu, Jul 31, 2008 at 10:39 PM, David Bradshaw wrote:

> Cheers, that does the trick but it seems to be very expensive, presumably

> due to constantly changing viewing angles. any ideas how i could speed it

>
> Cheers, that does the trick but it seems to be very expensive, presumably
> due to constantly changing viewing angles.  any ideas how i could speed it
> up
> ?
>
> thanks
>
> david
>

not sure exactly what you want without a patch, but couldn't you just use @transform_reset 1 or 2 on your 2D elements?

here is a test patch that should show what i am after

i need the plane and the sphere to be in 3d and be able to be controlled using handle

i need the text and the ellipse to be in 2d and ontop of the 3d objects

The patch shown works but it is very slow on my computer (which in fairness isnt very powerful but it does handle the rest of my jitter work OK)

I am aware of what transform_reset should do but none of the objects seem to have it listed as an attribute...

i'm a big proponent of the @layer attribute. You will probably also want to set your text2d's blend_mode to 6 7.

i'm a big proponent of the @layer attribute.  You will probably also want to set your text2d's blend_mode to 6 7.

> here is a test patch that should show what i am after

> i need the plane and the sphere to be in 3d and be able to be controlled using handle

> i need the text and the ellipse to be in 2d and ontop of the 3d objects

> The patch shown works but it is very slow on my computer (which in fairness isnt very powerful but it does handle the rest of my jitter work OK)

I'm getting a nice solid 60fps from your patch... just you know, fyi.

David Bradshaw skrev:
> hi
>
> here is a test patch that should show what i am after
>
> i need the plane and the sphere to be in 3d and be able to be controlled using handle
>
> i need the text and the ellipse to be in 2d and ontop of the 3d objects
>
> The patch shown works but it is very slow on my computer (which in fairness isnt very powerful but it does handle the rest of my jitter work OK)
>
I'm getting a nice solid 60fps from your patch... just you know, fyi.
Andreas.


2d on top of 3d