Revert back to 4.7

tomsfo1

Can I revert back to 4.7? If so how can I do it?

I am very unhappy with the IRAY renders. 40 plus minutes for a 800 x 600 frame. And it was nowhere near what was indicated with Scene Light on. (Although it did produce an interesting effect).

Can I optionally render without IRAY in 4.8?

will2power

Yes. You can still used 3Delight in 4.8. You just have to change it in the Render Settings tab. There's like a drop-down list for the render engine.

tomsfo1

Thanks for your assistance.

SpottedKitty

How is your scene lit? That massively blown-out lighting looks like you don't have any actual lights in the scene (mesh or environment lights don't count) so the camera headlight is still turned on. Select your camera, turn off the Headlight in the Parameters tab, and try rendering again.

Oso3D

And if it IS your scene lighting, you can turn down exposure in tone control (under render settings).

I would heartily suggest that folks give it at least a week of experimentation before you render (heh) judgement. After all, how long did it take you to learn 3delight?

I was very grumpy with Iray for the first week, and now you couldn't pay me to go back.

BeeMKay

SpottedKitty said:

How is your scene lit? That massively blown-out lighting looks like you don't have any actual lights in the scene (mesh or environment lights don't count) so the camera headlight is still turned on. Select your camera, turn off the Headlight in the Parameters tab, and try rendering again.

It looks more like a distant light at default luminence to me...

tomsfo1

Thanks for the additional comments. I turned down the intensity of my lights by half. Distant light from 80% to 40%, Linear Point from 100% to 50%. Obviously, there is something that I'm missing and I'm going to have to bone up on Iray. But by default, I would think I should get something close to the DAZ frame - what-you-see should be a close approximation of what-you-get - but no.

There are only two elements in my scene: the backdrop and Victoria 6.

At the moment I'm at 95% of the render, there has been 3749 iterations and 1 hour 27 minutes into the render. The render window has not changed a bit since the render began. I have no idea why it is taking so long or the need for so many iterations - it is only 800 x 600. There is nothing otherwlse running on my PC.

Auto Headlamp is set When No Scene Lights.

Additional comments/thoughts are most welcome.

The Blurst of Times

There are a lot of moving parts. Lighting is an art form in itself, so don't dismiss it as a non-factor in your work. Lighting is magical, not a WYSIWYG endeavor with this technology. The viewport just will not do physics like the renderer will. There viewport is more like a set of guidelines, not a hard & fast set of rules. Otherwise you could just take screenshots of the view and be done with it.

So you have a distant and a linear point. There's more than one way to rig those. I use the photometric dials myself. The lumen output per surface area makes the most sense in my head.

You're also dealing with the camera, and how it accepts the light. What settings do you have on the camera?

tomsfo1

I appreciate your comments. I need to go for an appointment so I will check the camera settings when I get back, as I can't to so while it is rendering. I am at 1 hour 54 minutes into the render. A little ridiculous to me. Right now I don't see the benefit of Iray over 3Delight. But I remain open to it as I work on my learning curve.

The Blurst of Times

The learning curve is significant, and there's no helping that. It's not a simple transition from 3delight to Iray. The rendering engine is very different, and the outcomes will be different. Not necessarily better.

I like Iray because I feel as if it's simpler to set up a photorealistic image. 3delight can do that as well, but Iray handles the photons for you. The lighting just is. 3delight doesn't have all the physics-based light, and you often have to do things to make it look like what Iray can do without effort.

3delight has its own strengths, though. If you prefer it, then you can still use it in 4.8

BeeMKay

tomsfo1 said:

Thanks for the additional comments. I turned down the intensity of my lights by half. Distant light from 80% to 40%, Linear Point from 100% to 50%. Obviously, there is something that I'm missing and I'm going to have to bone up on Iray. But by default, I would think I should get something close to the DAZ frame - what-you-see should be a close approximation of what-you-get - but no.

There are only two elements in my scene: the backdrop and Victoria 6.

At the moment I'm at 95% of the render, there has been 3749 iterations and 1 hour 27 minutes into the render. The render window has not changed a bit since the render began. I have no idea why it is taking so long or the need for so many iterations - it is only 800 x 600. There is nothing otherwlse running on my PC.

Auto Headlamp is set When No Scene Lights.

Additional comments/thoughts are most welcome.

The regular sliders are not changing the light's brightness in Iray.

In lights, you have to change the brightness not in the intensity, but in the "Luminence" settings at the bottom of the Parameter tab.
The default value is 1500.
For all lights, a good starting point is 45.000 units. The only exception to this is distant light, which has to be toned down to 10-15 units max.

I did a few illustration renders about this a while ago, which you might find useful (or not), posts 11-15:
http://www.daz3d.com/forums/viewreply/820983/
The setting you need to change is marked at the bottom left side of the first and second image.

Also, in "Render Settings", go to the "Advanced" tab and check "OptiX" for your CPU. It speeds up render times a bit.

Ghosty12

You can also set the wattage of the light source as well (more so mesh/emitter type lights) and that can make a big difference.. Also the shutter speed can make big changes as well..

tomsfo1

Once again, thanks to all for your assistance and comments.

Regarding the question on the Camera setting, they are all at their defaults: Perspective = On, Frame width = 36 mm, Focal Length = 65mmm, Depth of Field = On, Focal Distance 140.75, F.Stop = 22, Lens thickness = 0.

I did not notice any acceleration by clicking on OptiX Prme Acceleration. My second render was a little over 1 hour 51 minutes. About the same as the unchecked first attempt.

For the second attempt I did reduce the Luminous Flux (Lumens) from default 1500 to 750 for the Distant Light. I noticed a slight improvement.

My next render I reduced the Distance light Lumens all the way down to 15. And the Linear Point Light by half again to 375 from 750. This seems to be a lot better from what I see although the render is still running.

So my learning curve is getting better, but not there yet. I'm really surprised I have to reduce the Distance lumens way down from the default of 1500 to 15. That is an exponential difference.

Thanks again. I hope these posts will help others finding difficulty with Iray.

The attached screen snip is from the ongoing render with Distance lumens at 15. I can now see the backdrop and highlights are not washed out to while.

CypherFOX

Greetings,

tomsfo1 said:

I did not notice any acceleration by clicking on OptiX Prme Acceleration. My second render was a little over 1 hour 51 minutes. About the same as the unchecked first attempt.

You may be hitting the 2 hour time limit; the real question is how many iterations did it do in that timeframe.

Something about the previous (over burned) shot seems kinda...cool, to me. :) Still, the newest is looking much more like what you probably want!

-- Morgan

tomsfo1

Well, I have been converted. I must say the long render time is worth the wait. My screen snips compare Iray with 3Delight.
First Iray - but looks a bit grainy.
Second 3Delight no change in settings.
Third 3Delight increased intensity to Distant 80, Linear Point 75.
Fourth 3Delight increased to 100 and 100.

I agree, the original washed out image creates an interesting effect.

Thanks to all.

Karibou

tomsfo1 said:

Thanks for the additional comments. I turned down the intensity of my lights by half. Distant light from 80% to 40%, Linear Point from 100% to 50%. Obviously, there is something that I'm missing and I'm going to have to bone up on Iray. But by default, I would think I should get something close to the DAZ frame - what-you-see should be a close approximation of what-you-get - but no.

There are only two elements in my scene: the backdrop and Victoria 6.

At the moment I'm at 95% of the render, there has been 3749 iterations and 1 hour 27 minutes into the render. The render window has not changed a bit since the render began. I have no idea why it is taking so long or the need for so many iterations - it is only 800 x 600. There is nothing otherwlse running on my PC.

Auto Headlamp is set When No Scene Lights.

Additional comments/thoughts are most welcome.

Do you have an NVIDIA video card? If so, do you have that GPU checked in the advanced render settings tab? (Iray won't use it if it isn't selected.) And did you select optiXprime acceleration? Those will speed your render times A LOT. If you don't have an NVIDIA card, then your CPU will do the rendering, and it will likely be slower than 3Delight.

tomsfo1

Karibou said:

tomsfo1 said:

Thanks for the additional comments. I turned down the intensity of my lights by half. Distant light from 80% to 40%, Linear Point from 100% to 50%. Obviously, there is something that I'm missing and I'm going to have to bone up on Iray. But by default, I would think I should get something close to the DAZ frame - what-you-see should be a close approximation of what-you-get - but no.

There are only two elements in my scene: the backdrop and Victoria 6.

At the moment I'm at 95% of the render, there has been 3749 iterations and 1 hour 27 minutes into the render. The render window has not changed a bit since the render began. I have no idea why it is taking so long or the need for so many iterations - it is only 800 x 600. There is nothing otherwlse running on my PC.

Auto Headlamp is set When No Scene Lights.

Additional comments/thoughts are most welcome.

Do you have an NVIDIA video card? If so, do you have that GPU checked in the advanced render settings tab? (Iray won't use it if it isn't selected.) And did you select optiXprime acceleration? Those will speed your render times A LOT. If you don't have an NVIDIA card, then your CPU will do the rendering, and it will likely be slower than 3Delight.

Thanks for your response.

No NVIDIA video card.

I did select OptiX Prime with no noticeable improvement.