linear IES light

[pailhead]

Has anyone ever been able to make a linear light using ies files and vray?

[vlado]

It won't work for the time being; it would be better to use a thin rectangle light. However we are working on extending the "Use light shape" option to affect not only the shadows, but the light distribution as well.

Best regards,
Vlado

[pailhead]

The vrayies icon is just for aesthetics? No matter what it will always act as a point light?

[pailhead]

Hi Vlado,

Is there an ETA on this feature? It still seems like there is a lot of advantage when using vrayies lights instead of max's native photometrics, they just take forever to render, and i'm afraid to go crazy with their numbers.

Honestly, even though i'm getting some experience working at a lighting design studio, i'm still very confused by the IES files. A program we use here, visual, seems to always load them correctly, and people take the calc numbers they get from it for granted, as in, it's the absolute truth. Importing the same files in max, gives different results, and i'm confused by the fact that you can actually change the base of the light (point, linear, rectangular) using the same file, as well as the size. I notice that when you increase the size of a linear fixture, it just falls apart, makes it seem like there are two point sources.

Would be really useful if this could perhaps be compared to a lighting calc program. You probably know more math than all the lighting designers in the world combined.

[GLASS-CANVAS]

Hi Vlado,
Is there any chance you can add a 'store with irradiance map' option to VRay IES lights? And speaking of which could you also add the 'store with irradiance map' option to the new VRay light lister too please?

[pailhead]

Is there a chance that this option would be featured at all?

[vlado]

Which one?

Best regards,
Vlado

[pailhead]

vrayies light to read and render linear fixtures correctly?

[andybot_cg]

Would that this option were available, then it might "trickle down" to the vray for SU crowd... :P

[pailhead]

i dont understand

[vlado]

vrayies light to read and render linear fixtures correctly?

Yes, for the next service pack the "use light shape" option has been extended not only for shadows cast from the light, but also for illumination.

Best regards,
Vlado

[andybot_cg]

i dont understand

Updates to the vray engine should find their way into the vray plugin for Sketchup eventually. I'm glad to see attention paid to ies lighting. I've been disappointed with the limited implementation of ies thus far.

[snivlem]

What's the difference between the ies light and a linear ies light?

[andybot_cg]

currently, any ies light is a point source. If you are trying to model the light distribution of a flourescent tube, a point source won't be correct at all. The best option currently is to use an area light, however, this is bi-directionalm so you get slight (but unavoidable) shadows at 0 degrees and 180 degrees. Whereas a linear ies source could distribute light in all 360 degrees to whatever profile the ies distribution is set at.

[muoto]

yes yes yes, please send out the SP's