Render times went thru the roof. I just dont know why?

[Kinetic99]

Hello and thanks for your time,

I had a scene with Vray reflective materials, HDRI map, GI, 2/16, etc and I was getting render times of 2.5 hours. No problem,

All I did was in the Colour Mapping section in Vray, I increased my bright and dark multipliers value to create more contrast.

Boom, all of the sudden my render did not finish in the morning and would have taken 15 hours to complete.

Did I miss something? Is there a quick solution in bringing my times back down??
Thanks,
K

[vlado]

It would be best to take a look at the VRaySampleRate render element and see what happened.

Best regards,
Vlado

[Kinetic99]

After some trial and error I found that in my material (gold by the way) I had a simple colour in the diffuse channel. No maps or textures, just a dark, dark red colour. When I made my colour Black, the render times significantly dropped. ?
I don't know how adding a colour, other than black in the diffuse would increase my render times so much.
Any idea?
thanks for your time.

[vlado]

I'm not sure; probably depends on what else is there in the scene. If you can simplify it and post it here or send to support@chaosgroup.com we will be able to tell you more.

Best regards,
Vlado

[stevesideas]

I'd be interested to know the findings for this..