I tried using a spotlight and making it veery thin, but it would still spread out,
Is there any other way?
Ha that’s wierd! I just did this! Ok make an edge, and give it a material, then make it wire, then set emit to highest. Then make a blend texture, and add a color band, with the first stick thingy set it’s alpha to .6 and add a middle one with the same, and the last one to zero alpha, make it affect col and alpha, then in the “map to” change it to UV.
You can make it look good with a few nodes. there’s a recent article at blendernation that features a video tutorial on composite nodes by redbyte. He is doing a treatment for an internally illuminated ‘walk’ sign, but I think the same principles can easily carry over into laser making.
just use an elongated cube with the alpha transparency down a little.
Photo pretty much says all, what it doesn’t say though is that I have 2 render layers, and it renders layer 1 and 2 separately with the laser on layer 1, and any geometry on layer 2.
