Using textures - jogl

[ninjam]

Hi,

I have the following problem:
I bind a 2d-Texture (the picture contains one grey rectangle ) on a 3d-object - works fine. When I zoom into the screen: small dots, which are not in the picture, appear - zooming further these dots disappear. Can somebody tell me why these dots appear and maybe how I can avoid them?
Another problem is, that when I bind a blue textures - jogl displays this textures in orange. What’s the reason for this colorchange?

Thanks!!

[kbr]

@ninjam

Hi,

I have the following problem:
I bind a 2d-Texture (the picture contains one grey rectangle ) on a 3d-object - works fine. When I zoom into the screen: small dots, which are not in the picture, appear - zooming further these dots disappear. Can somebody tell me why these dots appear and maybe how I can avoid them?

Do you have two nearly-coplanar polygons? The dots might be a polygon in the back “z-fighting” to show through the topmost one.

Another problem is, that when I bind a blue textures - jogl displays this textures in orange. What’s the reason for this colorchange?

Sounds like you need to switch from e.g. GL_RGB to GL_BGR or GL_RGBA to GL_BGRA.

[ninjam]

@Ken Russell

@ninjam

Hi,

I have the following problem:
I bind a 2d-Texture (the picture contains one grey rectangle ) on a 3d-object - works fine. When I zoom into the screen: small dots, which are not in the picture, appear - zooming further these dots disappear. Can somebody tell me why these dots appear and maybe how I can avoid them?

Do you have two nearly-coplanar polygons? The dots might be a polygon in the back “z-fighting” to show through the topmost one.

Another problem is, that when I bind a blue textures - jogl displays this textures in orange. What’s the reason for this colorchange?

Sounds like you need to switch from e.g. GL_RGB to GL_BGR or GL_RGBA to GL_BGRA. - That’s ist - thanks

Yes, I think I have nearly-coplanar polygons. Is it possible to suppress that " z-fighting"?

[bleb]

You can do any of:

• Increase the precision of the z-buffer
• Make your near and far clipping planes closer together
• Use glPolygonOffset to force one of the polygons to appear in front of the other

to reduce z-fighting