Rendering not rending correctly

xgonagitya

So, i built a set, added my 3 point light set up, added my hdri,etc. When I go to render my picture comes out all grainy and not clear at all. What did I miss and how can i correct this? Also, how long should my renders take? This one took upwards of 4 hours and looks like crap.

i am using GTX 1050ti and 32gb system memory.

 

Thanks for the help.

L'Adair

The length of time it takes to render a scene varies depending on the scene and your hardware. Your GTX 1050ti has only 768 CUDA cores and 4GB of on-board memory. If a scene doesn't fit on the 4GB of memory, rendering will drop to the CPU. It isn't always obvious why a scene will drop to CPU only. I did a scene some time back that was well within the 8GB of my card, but would only render with the CPU. (I tried restarting DS, and when that didn't work, I restarted my computer. Didn't matter.) I suspect it was the number of instances in the scene.

Iray will calculate for everything in your scene, even if it's not visible to the camera. The attached image appears to be using a Depth of Field camera. If your set consists of a number of objects that are being blurred by the DOF, that could cause a lot of calculations that will slow down the render progress. And if it is enough to drop you to CPU only, the render will go very slowly.

Have you tried rendering with the DOF setting disabled? I'd be interested in comparing the quality of both the DOF and the non-DOF images; As well as the time it takes to render without DOF compared to the 4 hours with it.

Also, I recommend turning Enable Quality to Off in the Progressive Rendering settings of the Render Settings tab. This stops the software from trying to find convergence, which should speed things up a little bit.

Once Quality is disabled, the software will automatically stop rendering when either Max Time or Max Samples are reached, whichever happens first. I "turn off" Max Time by setting it to 0, (zero.) Then I control the length of time the image renders by setting the Max Samples. If the image stops rendering, it's a simple matter of increasing the Max Samples and hitting the Resume button.

xgonagitya

Awesome. Thanks. I will do what u suggested n try again. N only one character in scene. No props it objects

xgonagitya

So i reran my render last night while i slept and the image came out even worse. I have no idea what it is even doing anymore.

 

I did try the above suggested stuff but it is still coming out white. My DOF is off, My enable quality is set to off now, MAx Time is "0" and Max Samples is set to 15k, just to be safe. 

 

I reran the render this morning and still getting the all white. I am confused what I did wrong. I have 3 point lights in the scene and turned the camera headlight off.

L'Adair

The second image looks like your lights are way too bright. But I assume you didn't change the lights.

Did you change anything else besides the Progressive Rendering settings, and DOF? In Tone Mapping, you can change how light or dark a scene is rendered by changing the Exposure Value. It's locked by default, so changing some parameters that affect EV will cause others to compenstate. You have to unlock the parameter to change the value, so you'd remember if you changed this value.

If you zip the scene file and attach it here, I can take a look at your settings. (Don't worry about the figure,clothing and hair. DS will throw an error at me, but still load. I can always plug in a figure I have in my runtime to test it.)

Novica

First of all, in the Tone Mapping section, the sliders move a bit wonky. Meaning, when you move certain ones, others move, and it's not a simple number one moves number two, two moves three, etc.

Move them in this order- Film ISO FIRST. That moves Exposure Value, which is the first slider. Set Tone Mapping to 135.  THEN for Exposure Value, remember the lower numbers are BRIGHTER. Move that slider to 14.25 and do a pre-test. Then move it to 13.75 to lighten it if it's too dark. If still too dark, move to 13.25.  Just change exposure value until you're happy. Let us know how this works.