Strange spots on stitches

Taoz

I'm having a strange problem with this outfit:  https://www.daz3d.com/miss-mecha-outfit-for-genesis-8-females

All the stitches look strange with dark blue and yellow-green spots everywhere, when rendering.  There's nothing abnormal to see in Texture Shaded mode, and the promos look totally normal too.

Any idea what can be causing this?  Have tried everything, change lighting, mess with shaders, nothing helps.

DS 4.21.0.5

SofaCitizen

From initial viewing it looks like missing texture maybe? I do have that outfit so I can take a look to see if I get that also.

EDIT: Yep, I get the same :/

Taoz

SofaCitizen said:

From initial viewing it looks like missing texture maybe? I do have that outfit so I can take a look to see if I get that also.

EDIT: Yep, I get the same :/

OK, thanks, looks like a general problem then.  Missing texture or shader files would usually cause DS to complain about missing files.  I suspect it's an Iray update that's causing it, since the promo renders, which are over 2 years old, look OK.

Richard Haseltine

I don't hae that set. I just looked at the file list and all the maps seem to be jpgs, which doesn't usually have issues - still, it may be worth opening them in an image editor to see if it reports any issues (I would try extracting the /runtime/textyures folder from the zip to a convenient location rather than drill down through the content library,  especially if you don't install through Daz Studio and as a result everything is merged into a single folder tree).

barbult

It is not a problem with the product textures. It is an issue with your Render Settings and how they tell Iray to compress image textures. Go to the Advanced tab of Render Settings and increase the values of the Medium Threshold and High Threshold for Texture Compression. I see that a value of 2048 works OK. Normally the High Threshold would be set to a larger value than Medium Threshold, but I didn't even bother with that for this test. Higher values in these fields will use more GPU memory, so don't get carried away and don't increase them above default values unless you need to.

The attached image is just an Iray preview. Actual render also looks fine with these values.

 

SofaCitizen

barbult said:

It is not a problem with the product textures. It is an issue with your Render Settings and how they tell Iray to compress image textures. Go to the Advanced tab of Render Settings and increase the values of the Medium Threshold and High Threshold for Texture Compression. I see that a value of 2048 works OK. Normally the High Threshold would be set to a larger value than Medium Threshold, but I didn't even bother with that for this test. Higher values in these fields will use more GPU memory, so don't get carried away and don't increase them above default values unless you need to.

The attached image is just an Iray preview. Actual render also looks fine with these values.

 

Thanks. That works and beats the method I was attempting which was to mash the texture with the spot-healing brush.

barbult

Any time you see smearing of high contrast textures like that in your render, suspect the Iray image compression as the source of the render problem.

AllenArt

barbult said:

It is not a problem with the product textures. It is an issue with your Render Settings and how they tell Iray to compress image textures. Go to the Advanced tab of Render Settings and increase the values of the Medium Threshold and High Threshold for Texture Compression. I see that a value of 2048 works OK. Normally the High Threshold would be set to a larger value than Medium Threshold, but I didn't even bother with that for this test. Higher values in these fields will use more GPU memory, so don't get carried away and don't increase them above default values unless you need to.

The attached image is just an Iray preview. Actual render also looks fine with these values.

I suspected it was this, but wasn't sure ;)

barbult

AllenArt said:

barbult said:

It is not a problem with the product textures. It is an issue with your Render Settings and how they tell Iray to compress image textures. Go to the Advanced tab of Render Settings and increase the values of the Medium Threshold and High Threshold for Texture Compression. I see that a value of 2048 works OK. Normally the High Threshold would be set to a larger value than Medium Threshold, but I didn't even bother with that for this test. Higher values in these fields will use more GPU memory, so don't get carried away and don't increase them above default values unless you need to.

The attached image is just an Iray preview. Actual render also looks fine with these values.

I suspected it was this, but wasn't sure ;)

Yes, that was my immediate thought, too. I happen to own the product, so I tested the theory. Yup, that was it.

Taoz

barbult said:

It is not a problem with the product textures. It is an issue with your Render Settings and how they tell Iray to compress image textures. Go to the Advanced tab of Render Settings and increase the values of the Medium Threshold and High Threshold for Texture Compression. I see that a value of 2048 works OK. Normally the High Threshold would be set to a larger value than Medium Threshold, but I didn't even bother with that for this test. Higher values in these fields will use more GPU memory, so don't get carried away and don't increase them above default values unless you need to.

The attached image is just an Iray preview. Actual render also looks fine with these values.

Ah, yes that fixes it, thanks!  Just strange that it hardly seems to affect any other part of the clothing, which is why I didn't think of in terms of compression.