[Please see latest post for a new screenshot of the current condition.]

 

Sooo I've been working on my TESR, and am trying to just draw a dang block 

Apparently, harder than expected. So I made a method to do it for me. And it DOES draw the block with the proper texturing! Unfortunately, it also makes the block flicker black randomly across the surface as I move around it. I THINK I may have messed up the UV mapping, but I'm not sure...

protected void drawBlock(float x, float y, float z, float w, float h, float l, Block block, int meta){
	IIcon[] icons = new IIcon[6];
	for(int i = 0; i<6; i++){
		icons[i] = block.getIcon(i,meta);
	}
	GL11.glPushMatrix();
	GL11.glTranslatef(x, y, z);
	tess.startDrawingQuads();
	//top
	tess.setNormal(0.0F, 0.0F, 1.0F);
	tess.addVertexWithUV(w,h,l,icons[1].getMaxU(),icons[1].getMaxV());
	tess.addVertexWithUV(w,0,l,icons[1].getMaxU(),icons[1].getMinV());
	tess.addVertexWithUV(0,0,l,icons[1].getMinU(),icons[1].getMinV());
	tess.addVertexWithUV(0,h,l,icons[1].getMinU(),icons[1].getMaxV());
	//bottom
	tess.setNormal(0.0F, 0.0F,-1.0F);
	tess.addVertexWithUV(w,h,0,icons[0].getMaxU(),icons[0].getMaxV());
	tess.addVertexWithUV(w,0,0,icons[0].getMaxU(),icons[0].getMinV());
	tess.addVertexWithUV(0,0,0,icons[0].getMinU(),icons[0].getMinV());
	tess.addVertexWithUV(0,h,0,icons[0].getMinU(),icons[0].getMaxV());
	//south
	tess.setNormal(0.0F, 1.0F, 0.0F);
	tess.addVertexWithUV(w,h,l,icons[2].getMaxU(),icons[2].getMaxV());
	tess.addVertexWithUV(w,h,0,icons[2].getMaxU(),icons[2].getMinV());
	tess.addVertexWithUV(0,h,0,icons[2].getMinU(),icons[2].getMinV());
	tess.addVertexWithUV(0,h,l,icons[2].getMinU(),icons[2].getMaxV());
	//north
	tess.setNormal(0.0F, -1.0F, 0.0F);
	tess.addVertexWithUV(w,0,l,icons[3].getMaxU(),icons[3].getMaxV());
	tess.addVertexWithUV(w,0,0,icons[3].getMaxU(),icons[3].getMinV());
	tess.addVertexWithUV(0,0,0,icons[3].getMinU(),icons[3].getMinV());
	tess.addVertexWithUV(0,0,l,icons[3].getMinU(),icons[3].getMaxV());
	//east
	tess.setNormal(1.0F, 0.0F, 0.0F);
	tess.addVertexWithUV(w,h,l,icons[5].getMaxU(),icons[5].getMaxV());
	tess.addVertexWithUV(w,h,0,icons[5].getMaxU(),icons[5].getMinV());
	tess.addVertexWithUV(w,0,0,icons[5].getMinU(),icons[5].getMinV());
	tess.addVertexWithUV(w,0,l,icons[5].getMinU(),icons[5].getMaxV());
	//west
	tess.setNormal(-1.0F, 0.0F, 0.0F);
	tess.addVertexWithUV(0,h,l,icons[4].getMaxU(),icons[4].getMaxV());
	tess.addVertexWithUV(0,h,0,icons[4].getMaxU(),icons[4].getMinV());
	tess.addVertexWithUV(0,0,0,icons[4].getMinU(),icons[4].getMinV());
	tess.addVertexWithUV(0,0,l,icons[4].getMinU(),icons[4].getMaxV());
	tess.draw();
	GL11.glPopMatrix();
}

 

Maybe some pointers would be nice, as none of the TESR tutorials I found specifically deal with drawing cuboids...

 

[EDIT] So, apparently I forgot the turn off the actual block's rendering, but in the process I learned this method is messed up in many ways regardless. Maybe I should restart it from scratch? I'd still appreciate any and all advice.

Unfortunately, it also makes the block flicker black randomly across the surface as I move around it.

 

That's called Z-Fighting.

https://en.wikipedia.org/wiki/Z-fighting

Yeah, got that bit covered. See the [EDIT]. Thanks anyway though, now I know a technical term for it!

 

[EDIT] So now I am getting the blocks to render properly (the order of some of the vertices was wrong before), but now the oddest thing happens: If I am not looking in a limited cone of directions (on all axis), none of the blocks render at all. They all disappear at once, not one at a time. It is therefore not to do with the Render Bounding Box..

 

[EDIT2] After a little more experimenting, it seems to only draw if I WOULD be able to see coordinates 0,0,0 in my crosshairs. Am I messing up translation or something? None of my other drawing commands are showing this behaviour so I think I may be using the Tesselator wrong...

 

After a lot more testing and trying, I've come up with a few more facts of the case:

 

• My assessment that it had to do with looking at the 0,0,0 point has been proved false. It depends on the world, it seems.
  
• The problem is limited to this method, and even then only when it is called in render pass 0.
  
• However, rendering in pass 1 instead seems to invert both the internal and external drawing order among the Tile Entities. The inside is drawn outside causing weird overlaps and a very Escherian feeling...
  

 

I feel like I'm getting closer, but there is still a few things that elude me here...

 

[EDIT] Felt it was time for another screenshot of the current situation. This shape is made up of 5 cuboids, just for testing purposes. It is currently being drawn in render pass 1.