NVIDIA Iray Render Troubles
athompson283
Posts: 7
I'm having issues with the NVIDIA Iray render preview as well as the rendering itself. I've set up my scene and I have lights but when I go to preview the image (or just go to the NVIDIA Iray mode) it comes out as an all black image. I really don't understand what I'm doing wrong, can someone please help?
Post edited by athompson283 on
Daz 3D is part of 
Connect
DAZ Productions, Inc.
7533 S Center View Ct #4664
West Jordan, UT 84084
Licensing Agreement | Terms of Service | Privacy Policy | EULA
© 2024 Daz Productions Inc. All Rights Reserved.
Comments
I suspect from the image you are not using lights created specifically for iray as those look like 3DL sets
I notice other lightsets load but with photometric switched off so You can go to each light & switch it on to photometric but they will need a lot of fiddling & I have never had much luck getting it right
The issue with that idea is that even without the lights it does the same exact thing. I only added the lights because of what it was doing because I thought maybe it was too dark and just didn't have anything to load, yet even after it's still doing this.
I do not know,which light set (or light preset, mesh light etc) you use, , at first, you can use head lamp.
go to render setting pane>editor>general, then set "Auto head lamp" as "use no scene light"
then from top menu, window, preview light. if the light icon is dark, it means you use Preview light , Pic1
Usually I use new Camera, then in camera tab, headlamp on. in room rendering
add new camera (if it is not ,in your scene)
then you can change view from Perspective view to camera view. go to camera tab, then check head light.
I usually use camera head light to see all, in room render with iray.
after that, add new light or use product light for iray. then adjust scene light (then head light off (if I hope so))
And,, usually if you first use daz default photometric light in room render, (no enviroment light, off head lamp, no other scene light)
you may need to set light power (luminos flex ) large value than default. or get very dark render.
in my test scene, I now set two photometric spot light (one is rectangle, one is point), one is set 15000, two is set 7000, without other scene light, head lamp.
with templeture (light color,,) (6500K , 3200K)
I may need to add mesh light for celling to light-up room . I usually use mesh plane and apply light shader.
(mesh and apply iray light shader, give you more controll for light setting,
select mesh surface , then shaders>iray>emissive, you can use daz offer default iray emissive light shader ,without product light. then play each parameters.
You have to set the Tone Mapping settings for the lights in the scene just like you would a camera.
Is this an interior scene? Have you switched off the default Environment light? If so, then you will still have the default Tone Mapping settings as mentioned upthread — and they're set as default for outdoors and a bright sunny day. You must check the Tone Mapping settings, and change them to something that will give you decent lighting for your scene.
It's just like a manual camera (and in fact the Tone Mapping controls are named exactly the same) — if the camera settings aren't right for the light conditions, the photo you get will be useless.
Could someone tell me where the Tone Mapping is?
Also, I don't know if this has anything to do with my first issue, but I followed Totallou's instructions on everything exception the mesh part - just because I have no idea how to do that - and the scene is now bright and has details, but it's all very noisy. How on earth do I fix this? I tried messing with the Noise Degrain settings (Noise Degrain Filtering set to 2, Noise Degrain Radius set to 4, Blur Difference set to 1) and also the Progressive Rendering settings (Min Sample: 0, Max Sample: 15000) but it hasn't fixed all of the noise.
I did notice that when I set the aforementioned settings that it made the image LESS grainy, but it didn't take care of all of it. Help?
Tone Mapping is under Render Settings.
From the looks of that screen shot you have an old product and an old light set that might even be Poser based... converting that to Iray might be challenging.
But you really, really want to look at your Tone Mapping settings. Up the ISO to at least 400, set your F/Stop to say... 4, and maybe change the Shutter Speed to 90.
Typically, you won't need to mess with the noise filter except in some extreme cases, or in situations where you may want noise in the render for artistic purposes. Getting more virtual photons (light) into our virtual camera is the key to getting rid of noise.
If you've made tons of changes in the render settings, at this point, it may be worth clicking the defaults button to get back to a baseline.
You might want to then go to the Environment tab in the render settings and set the top drop down to "Scene Only" (it defaults to Dome and Scene). Not changing this won't hurt anything, but if I remember right, the default render settings plugs the ruins HDRI that comes with Studio in to the dome and you may not want that casting light in to your scene.
Next, as others have said, take a look at the tone mapping settings. If you aren't familiar with how these settings work on a real camera, here are the basics:
F-Stop - The lower the number, the more light our virtual camera will take in. (technically, you are setting the denominator of a fraction here, so by lowering the number, you are actually causing the apeture of the lens to open wider, thus allowing more light to make it in)
Shutter Speed - For the sake of simplicity, the same rule applies: the lower the value, more light will make it in to the camera. What you're setting here is how long the shutter on the camera stays open, and like above, you're actually setting the denominator of a fraction. So if you set it to 60, that's actually 1/60th of a second.
ISO - On a real camera, this determines how sensitive the camera will be to light (or in the old days, how sensitive the film is to light). However, with ISO, the higher the value is, the more sensitive it is. So by raising the ISO value, more light will make it in to the final render, and therefore reduce (or hopefully eliminate) the noise. The default is 100, which is low, unless you're rendering an outdoor scene. Doubling it to 200 makes the render engine twice as sensitive. If you double it again to 400, then (as I'm sure you can guess) it becomes twice as sensitive than it was at 200.
Lastly, take a look at your lights also. From your screen shots, it looks like you have one or two "distant lights" in there. The distant light is designed to sort of simulate a strong light source from a long distance away (like the sun). Not too helpful for an indoor scene. Spotlights are ok, depending on what you're looking for in how the scene is lit. Consider changing the geometry setting on them to something other than point, though. Disk or Rectangle work well. You can change the dimensions as well. The larger the dimensions, the softer the shadows will be.
Thank you so much everyone for all your help! As it turns out, yes, the house environment I bought was an old product - that'll teach me to pay attention to specifications. But with all your help I managed to get it at least somewhat presentable, though I did have to do alot of post work in photoshop afterwards.