Texture problem

[Joppi]

Blue lines

This blue lines appears in my renderings, only for textured materials and without a logic reason? The blue lines seems to get more visible when looking along the green axis I think.

I´ve tried almost everything. Please do someone have an idea of how to get rid of them?

[fam_ark]

Re: Texture problem

Looks linke the line is in your texture...
Have you tried to crop the texture in photoshop?
give it a try and cut the pixel on the side of the texture.

have you looked at the mapping widget- is the line on its border?

greetings

jonas

[Joppi]

Re: Texture problem

Thanks for the input. Tried to crop the texture (looked ok before thou), and also changed the bitmap of reflection layer in the same way... They still there!

2 or three materials having the same bahaviuor. Its so annoying.

Also tried to adjust the "cutoff" under Options (dont know what it does). Setting it to 1, does the line dark red... wich is better.

More ideas?

[Joppi]

Re: Texture problem

Another Lo-res rendering during the work...
the black surfaces is two different textures.

The blue lines is a mystery?

[Joppi]

Re: Texture problem

The lines seem to get smaller when I render in higher quqlity (IM + QMC)...
Can it be something with the render setting?

[Micha_cg]

Re: Texture problem

Hmmm, I never have seen this befor and I used VfR daily. Could it be, that the texture is the problem. Try an other texture - same problem? It could be, that your texture has a very thin error line.

[Joppi]

Re: Texture problem

Thanks Micha! Nop, the lines occur in a couple of other textures as well (one for a floorcarpet for example), I´ve checked the textures twice, and they´re also made of me from scratch...

Strange. More ideas?

[Micha_cg]

Re: Texture problem

Best you send a simple example scene with texture per email to ASGvis or you post it here, so we could test it.

[Joppi]

Re: Texture problem

Thanks!

Here´s a ref. scene. The lines apperars just now and then, saved a viewport with the last lines.

This is a reduced scene. First i did an selected export, then the lines where gone!!??. So now I´m working with a scene that I first exported as whole. Works fine for the moment. Only very very small brown lines during prepas

[Joppi]

Re: Texture problem

Textures. (Converted from HI-res to low res)

[Micha_cg]

Re: Texture problem

No stripes here. But I get a reflection problem at the ground by your strong cutoff (material option). Best you let it at 0.001 instead 0.05.

Also the QMC noisethreshold of 0.1 is quite high - try to use 0.01 for good quality and .05 for preview and 0.005 for high quality. Adaptive amount 1 can cause irradiance map problems (blotches), try to keep at max 0.95.

Irradiance map: set max rate 0 only if you need fine shadow details, try to keep at -1 and set the (interpolation) samples lower (20..30) - this speed up the rendering.

Indirect Illumination secondary engine multiplier could be 0.8 allways. Helps to avoid to much indirect light bounces (helps against flat look and speed up the rendering too).

Lightcache: 1000 subdivs is a good general value and enable "use for gloss rays" - much speed up of reflection calculation.

And for your stripe problem - try to use PNG instead JPG. I use PNG allways. In the past I got problems by JPGs too.

Edit: you could enable "low thread priority" at the global switches. So you could better work on your model during rendering.

[Joppi]

Re: Texture problem

The greatest thanks Micha!

I´ll test converting the IMG to PNG later on today. The pictures are also very large (3500 px or more, since they are scanned) maybe it´s the thing? I´ts not often possible to use that size of textures, and not necessary either...

Thanks also for your input regarding rendersettings... that was one of my Low-res settings, but some of your points was really good help for me. Thanks!

What do the "cutoff" option do, by the way?

[dalomar_cg]

Re: Texture problem

From Spot 3d

Cutoff - this is a threshold below which reflections/refractions will not be traced. V-Ray tries to estimate the contribution of reflections/refractions to the image, and if it is below this threshold, these effects are not computed. Do not set this to 0.0 as it may cause excessively long render times in some cases.

So a really high threshold (close to one) will cut those reflections off very early. A really low threshold (0) may never cut them off. Keep it at .01 and you'll be fine