Problem with terrain black edges

#1 Hi Zealander, and T3D forumites,

I'm getting the same behaviour from T3D also. Not only do I get black seams on one side, but the texture coordinates seem to be wrapping around on another two edges. I noticed this problem with terrain exported from L3DT, but to be sure that program wasn't the problem, I created the following dummy texture in Paint.NET:


(the DDS is here)

When loaded in T3D over a random heightfield, the texture shows seams at the very edges, as shown below:

A black seem:


Colourful seam, wrapping texture from bottom to top:


Colourful seam, wrapping texture from side to side:


The fourth seam seems OK [sorry for the pun]:


This matches the the behaviour observed with terrain textures exported from L3DT. [I thought this texture might be a better example of the problem, being a little more...ahem...striking than grass or rocks.]

I have, of course, verified that there are no such seams in the base texture image or the DDS.

This problem is also found when I nuke the base texture DDS and rely on T3Ds texture blending, as shown below using the same terrain.

A black seam in blended terrain, as with the prebaked DDS:


Now, to the question(s):

Is this a known bug/feature of T3D?

Perhaps a mis-configuration of my/our projects in T3D? (i.e. mipmap settings, texture coordinate wrap modes, etc.) I am using here the FPS example included with Torque 3D 2009 SDK 1.0, and the terrain block in the mission file is defined thusly:

new TerrainBlock(theTerrain) {
	terrainFile = "art/terrains/test/test.ter";
	squareSize = "2.000000";
	tile = "0";
	baseTexSize = "512";
	screenError = "16";
	position = "-512 -512 0";
	rotation = "1 0 0 0";
	scale = "1 1 1";
	canSaveDynamicFields = "1";
};

For completeness, my graphics card is a GeForce 9600 GT, running driver version 8.17.11.9745 from the 3rd of April 2010. It's a Win7 Pro box, FWIW.

The reason I care about the edges is that I'm testing a tiled TER exporter for T3D, and these seams are appearing in the middle of the map, at the joins between tiles [quite aside from the geometry seam problem, which is now solved].

Many thanks in advance for any assistance or insight that may be rendered.

Best regards,
Aaron Torpy.

#2 Did you manage to fix this?

#3 No, i still did not :(

#4 Sorry to bring up an only thread, but this still exists in the latest version. Does anyone know what causes it?

#5 I don't suppose you guys have got SSAO on do you? Just thinking 'out loud' here.

#6 Thanks for the reply. I disabled it, (and confirmed by breaking inside the AdvancedLightingManager) it doesn't seem to help.