# Transparent laser focus

Did I understand the answer in this post correctly? It says that due to the fact that volumetric lighting is not implemented yet, creating a transparent laser focus with visible molecular spheres in it is not possible?

Right now I'm trying to see a sphere in a red "focus" and do not get the result I would like to have.

Screenshot of the properties:

• If you want to actually see "little spheres" you might be able to try a particle system – gandalf3 Oct 15 '13 at 22:15
• I saw particle systems and did not try. So I may give it a try. Right now I experiment with transparency and do not get transparent effects. I add a bit more to the question... – Stefan Bollmann Oct 15 '13 at 22:19
• The point is not, that they need to be "little" spheres. They only have to be so small that they can "diffuse" through the ray of light. – Stefan Bollmann Oct 15 '13 at 22:24
• – gandalf3 Oct 15 '13 at 22:28
• Do you want to do this in cycles or BI? – gandalf3 Oct 15 '13 at 22:29

# BI:

BI does have volumetric rendering, so you could you could use two Spot lamps with Halo enabled to get this effect:

1. ShiftA>Add > Lamp > Spot

2. Select the spot lamp and duplicate it with AltD to duplicate linked. This way all settings will be mirrored between each Linked Duplicate.

3. Rotate the duplicated lamp 180° (R180):

4. Enable Halo in Object Data > Spot Shape.

Note that to get volumetric shadows, Step will have to be set to 1 or higher:

Result:

# Cycles:

Cycles does not yet have volumetrics integrated, but they are planned to be in 2.69 or 2.70:

Plans

For 2.68, the following features are planned to be worked on: