Sensor mapping - text not hidden

[gbettega]

Hi,

the Express VI "Sensor mapping" puts a 3D text object into the scene:

the text position follows the mouse position, like a pointer.

The text is never hidden by the solid, irrespective of the its orientation

(see attached picture).

This is not trivial: using the "pick point" method I tried to do the same thing in one of my Vis:

a (actually) slighlty shifted text is inserted into the scene: when the mouse moves

the text changes its position. However, and this is expected, when the orientation

of the solid is changed the text is hidden: see the other figure.

How to obtain the "sensor mapping" effect (without using transparency)?

Thanks in advance

Giovanni

 

 

[Jordan Kuehn]

Check out these threads and see if they help you.

 

https://lavag.org/topic/18872-text-not-showing-up-under-semi-transparent-object/

 

https://lavag.org/topic/18931-3d-text-disappears-text-properties/

[gbettega]

Hi,

Actually it is not a question of transparency. My objects must be all opaque.

Just solved: (a not optimized) Vi attached

Giovanni

text cursor.vi

[shoneill]

Did you use Billboarding to solve the problem?  What was the solution exactly?

[gbettega]

Hello Shoneill,

bilboarding is used only to make the text face the camera.

The solution is highlighted in the attached picture.

The point in the window coordinate is projected onto the near plane,

obtaining a point P(x_P,y_P,z_P), then the 3D text is translated in that position.

Giovanni

[shoneill]

You can do this better with the blending bin and blending mode.  Your solution is always running after the 3D control to patch things up whereas a solution with the correct blending bin and blending mode will be automatic.  I recommend you re-visit the other methods posted as it's a far more robust solution.