Problem with hi-res texture maps

RHPLUS · 13 Apr 2011, 21:55

Is it possible to separate the texture maps used by Sketchup to display on the screen that do not require high resolution from the textures used by the V-ray?
V-Ray takes texture maps: difuse, transparency, bump and specular from the specified path on hard drive.
If You change the path to high-resolution difuse map in V-ray material editor then Sketchup automatically retrieves a map with the same path that is not needed for display on the screen and unnecessarily creats a monstrous skp file.
Is it possible to create a script to break this automatic dependency SU and V-ray paths? Sketchup saves miniature with UV coordintes and V-ray takes maps from HD and UV from SU.

thomthom · 14 Apr 2011, 10:07

Use a low res texture in the main (top diffuse) the one that's linked with SketchUp. Set its Transparancy slot ot use a TexAColor map - set to white colour. That way the layer is not visible in the render, but visible in SketchUp.

Then create a second diffuse layer with the high-res texture - this is the one you'll see when you render.

RHPLUS · 14 Apr 2011, 11:25

Thank you Thom for your prompt and valuable response. You are a true authority to me. I have no patience to bite deeper into sketchup structure, that's from what my question.

john2 · 13 Sept 2012, 10:36

@thomthom said:

Use a low res texture in the main (top diffuse) the one that's linked with SketchUp. Set its Transparancy slot ot use a TexAColor map - set to white colour. That way the layer is not visible in the render, but visible in SketchUp.

hello thomthom. can you post a screenshot, i'm not understanding the TexAColor thing

thomthom · 13 Sept 2012, 11:31

john2 · 13 Sept 2012, 11:37

@thomthom said:

[attachment=0:33kg7r82]HighLowRes.png[/attachment:33kg7r82]

wow!! thanks. .btw most good looking screenshot i've ever seen. what software? powerpoint?

thomthom · 13 Sept 2012, 12:10

@john2 said:

.btw most good looking screenshot i've ever seen. what software? powerpoint?

Screnpresso
http://www.screenpresso.com/

Best screen capture and video capture software I've ever used.

john2 · 14 Sept 2012, 02:35

hot!!

pierreaudouin · 4 Oct 2013, 09:02

This method works perfectly with the 1.49 release.
Does it works with 2.0?
I test it with 2.0 beta and i can't reproduce it.

Does it works with you?

pierreaudouin · 4 Oct 2013, 09:14

i answer my question !
i must uncheck "use texture as transparency"

rspierenburg · 4 Oct 2013, 11:47

At the risk of hijacking this thread. I have a Lap-Siding material that I want to be able to change color on through Sketchup rather than Vray. The actual texture will be constant with just the color changing. Is this possible? or do I have to make a new texture for each color?

Rob

valerostudio · 4 Oct 2013, 15:45

Got to have a new texture for each. Trust me, you will run into issues if you do not.

cuttingedge · 5 Oct 2013, 13:04

@thomthom said:

Use a low res texture in the main (top diffuse) the one that's linked with SketchUp. Set its Transparancy slot ot use a TexAColor map - set to white colour. That way the layer is not visible in the render, but visible in SketchUp.

Then create a second diffuse layer with the high-res texture - this is the one you'll see when you render.

Is this a good practice in general, to have two versions of maps, one low res and high res?Will it make my skp file more manageable in size but will yield better texture quality in the render?

callinas · 5 Oct 2013, 22:05

Ok, if I understand, I should have a texture for vray, but in sketchup model, the texture is a color? Is that?

valerostudio · 6 Oct 2013, 12:00

No. You have 2 diffuse textures essentially stacked. The first is low res and this will be in the upper Diffuse layer. Then you have the hi res as the diffuse layer underneath it.

SketchUp will use the one on top as the texture in your model. So, the trick here is to have that layer as a low res map and tell VR to render it 100% transparent, without the SketchUp window realizing it. We cannot use the transparency color box because this will also affect the transparency in the SU window.

What we do is under transparency apply a AColorTex in the map, then set that color to pure white.

This tells VR to ignore that layer and use the high res one underneath when rendering and because SU doesn't see at any of the VR tex parameters, the low res map stays in the SU window.

This trick is used quite a bit in many scenarios. Example would be if you needed to see a bump map of a texture in order to set the UVW mapping for something like water. It is very important to understand and have this one in your back pocket at all times.