Blocky material issue - Scanline Material

[Anonymous]

I've created a Scanline material using an aerial photograph to be draped over a terrain model, however half of it comes out kind of pixelated and blocky. This happens in perspective view and when rendering. I've attached an image showing a rendered view, you can see in the lower half its poor quality and divided into squares.

The material was created by adding the bitmap as a diffuse map to the Scanline Standard material.

[miledrizk]

Hi,

Did you add a mapping modifier? Like UVW Map or Unwrap UVW

Too little information to have a good guessing on this one

[Anonymous]

It looks like my graphics card before dying. Have your tried another computer or even changing temporarily the display to directX 9?

[Anonymous]

The model I'm working with is a large terrain model with 2.2million faces. I don't have much experience of working with UVW, wouldn't playing with the UVW map be impossible for such a large model? I've attached a screenshot of the model to show the complexity.

I'd attach the file for you to look at but its too large!

I tried changing the driver to Directx 9 but this had no effect.

[Anonymous]

2.2 millions of faces are Ok for Max from the point of view of polys alone

Max is unable to edit UVs with that high poly (and the same is true to other apps)  but it should be able to render. 3d scan programs as Agisoft Photoscan can create UVs for that size and a lot bigger.

In this point I would check if the bitmap and UVs are OK in another program: Zbrush, Maya or any other 3d viewer that is not the program that created the files.

If it is looking bad in other programs then the problem comes from the program that created the files.

[Anonymous]

At the moment I don't have any other software to check it on, could possibly get Maya but I've never used it before. 

I've tried the model with another bitmap, a brick texture, and I get the same issue. I've attached a couple of screenshots which show a comparison between the model and a box. The material looks fine on the box. Maybe I could reduce the detail of the model, do you know whet the geometry limit is for Max to create a UVW?

Essentially all I need is a planar projection, is there a way to do that without needing UVW map at all?

[Anonymous · Accepted solution]

Okay so I think the solution was to create UVW map and set it to planar. This drapes the image over the terrain without any corruption of the material texture. 

I'm a bit confused with the scaling as the UVW Map real world scale doesn't seem to work, but by manually scaling using the UVW Map gizmo I was able to scale it fairly accurately.

Thanks for your help everybody!

[Anonymous]

It is a UV problem. You can not redo the UVs in Max.

You could try a free 3d viewer. It will allow you to see if the problem is Max or comes from the program that generated it

http://www.senosoft.com/softp3doDownload.php

Double check your file format is supported first

http://www.senosoft.com/softp3doFileFormat.php

[Anonymous]

Just read your last post. Glad it worked, even I'm surprised that a simple planar UV can wrap correctly around mountains, houses etc. |I guess the view was far enough to that didn't matter.

[Anonymous]

Yeah I think for a large scale landscape view its fine. Its not going to look very good for more detailed or zoomed-in views though

Thanks for your help!