Problem with meshes

[timur.omelchak]

Some times meshes din't exports propertly, appears strange artefacts after adding a material as seen on attachment. In 3d max with same texture or checker pattern it looks perfectly. What can it be?

relef2_ground_17.rar

[binstream]

Can you send us the source .max file?

[timur.omelchak]

Here it.

road.rar

[ulf.schroeter]

Some times meshes din't exports propertly, appears strange artefacts after adding a material as seen on attachment. In 3d max with same texture or checker pattern it looks perfectly. What can it be?

 

Just a guess: Problem might be caused by UNIGINE half-precision-only texture coord storage format for rendering (mesh file stores tex coords with float-precision).

 

This leads to numerical precision issues during rendering when assigned texture coord values take too large values exceeding half-precision-range. This easily happens when assigning smaller tiling textures to large/long areas (e.g. 10m road segment texture to a 20km long road mesh with linear increasing u-tex coord 0-2000)

 

Therefore might be a variation of this problem

[timur.omelchak]

So...is there any decision for this?

[ulf.schroeter]

So...is there any decision for this?

 

Well, first of all it's a guess for the problem cause. Maybe you can check u/v texture coordinate value range for an area with artifacts in 3Dmax to verify this half-precision hypthesis.

[serega]

Timur, can you attach textures too?

[timur.omelchak]

See atachment.

Grass_roads.rar

[serega]

So...is there any decision for this?

 

The optimal decisions for this problem are:

1) Use Terrain Editor

http://docs.unigine.net/principles/objects/terrain/terrain_editor and

http://docs.unigine.net/tutorials/terrain/#edit_terrain

 

or if you want to use 3d max:

2) divide the object into several surfaces

3) move the object in the center coordinates

[steve3d]

I've been fighting with this a whole year, there is a simple solution, in uv editor, You can't just make the uv island everywhere you want, for example, a big object, large surface, and you placed some uv samples at (1000,2000), then after you export, this must happen, if you can make the uv placed in (-200, -200) to (200, 200), or even smaller, this will not happen in most cases.

 

This is because unigine texutre coordinate precision is half. I don't know why uv in that range won't have this problem.

[danni.coy]

I had no idea Max did this I thought by convention uvs mapped between zero and one or as closed to as possible.

[steve3d]

and also, you need to move object's center to it's own geometry center(bounding box center) as serga told you. this will also reduce the mesh triangle flicker.