ies and vrayies difference

[pailhead]

Normal ies:




vray ies





why is vrayies so sharp?

[pailhead]

Seems it was a shadow issue, but it's still confusing since both types occupy the same place.

[vlado]

VRayIES reads the shadow blur information from the .ies file itself; if the .ies file does not specify light dimensions, then the shadows will be sharp.

Best regards,
Vlado

[pailhead]

Is it complicated to input these dimensions into the .ies file manually?

[vlado]

No, it's a text file; but you have to know which numbers to change... I don't have the format specification with me right now, but I can try to find out which are the numbers later today.

Best regards,
Vlado

[pailhead]

Maybe the light source size should be present as a parameter? Maybe the .ies files aren't standardized enough for all to feature this info?

[vlado]

The standard is quite well defined; ideally manufacturers would specify the actual real-world light dimensions there, but as mentioned above it's not too hard to modify the IES file.

Best regards,
Vlado

[vlado]

Also, a more or less detailed description of the format can be found here: http://www.helios32.com/Thinking%20P...cally%20II.pdf (look at pages 31-34, Appendix A).

Best regards,
Vlado

[peterguthrie]

Super handy tip by voxel3d here: http://www.chaosgroup.com/forums/vbu...236#post392236