Laser Light

[OnoSendai]

Here's a nearly monochromatic peak spectrum light:

Code: Select all

  <meshlight>
    <rotation>
      <matrix>
        1 0 0 0 1 0 0 0 1
      </matrix>
    </rotation> 
    <pos>0.0 0 0</pos>
    <scale>1.0</scale>
    <mesh_name>lightmesh</mesh_name>

    <!-- define the emission spectrum-->
    <spectrum>
		<peak>
			<base_value>0</base_value>
			<peak_value>100000</peak_value>
			<peak_min>495</peak_min>
			<peak_width>10</peak_width>
		</peak>
    </spectrum>
  </meshlight>

Light emitted is between 495 and 505 nm

[Kram1032]

Ono, there already where problems with an unblended mirror, right at the beginning.

the light seems to exactly reflect back the way it came, here, with a pure specular mirror. No blend....

Oh, and besides the thickness, I didn't mention to check the normals...
they should also point in the correct direction...

[OnoSendai]

Might be a bug, but specular + participating media should work fine, see for example caustic_participating_media_test.igs

[dougal2]

now that we have IES lights, the lightbox/slit method is a bit redundant.

save this into an .ies file:

Code: Select all

IESNA:
TILT=NONE
1 1000.00 1 3 1 1 2 -0.090 0.000 0.000
1.0 1.0 75.00

0.00 0.600  
90.00 
0.00
 1.0E+0012  0.00  
 0.0 

edit: simplfied IES data. you can try to change the 0.600 value to set the divergence angle, but I found that anything less than 0.600 didn't render on my simple test scene.

[Kram1032]

yeah, that's a nice IES
I guess, the problem is, that lower angles are very unlikely to get found...

now, that I see your simple example (I already opened IESes but I didn't think about it, yet)
do you think, Indigo will get negative values correctly? xD
(even if it wasn't like light, that kills other light, it would make the angle even smaller due to the blend )

[WytRaven]

Watching this thread with great interest as I plan to use lasers on my finished robot.

By the way Ono is it possible to do non-uniform 'density' participating media in indigo? So what I mean is the ability to add some sort of 'turbulance' or something to the scattering?

[Kram1032]

you mean, clouds, dust, smoke, etc?
Ono once showed some work with particles (which would be needed), but he never talked again about that, since quite some time...
Not even bringing back the old thread helped...