Textures

[nickdotjava]

I have this code from the LWJGL examples:

1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23

public Texture loadImage(String filename) throws Exception {         Texture texture = null;         BufferedImage tmpImg = null;                  /* normally I would use StringUtils.isValid(String) from the            jakarta commons lib, but thats beyond the scope of this lesson */         if ((filename != null) && (filename.trim() != "")) {             try {                 InputStream is = getClass().getResourceAsStream(filename);                 tmpImg = (BufferedImage) ImageIO.read(is);                 if (tmpImg == null) {                     throw new Exception("Error: Got null from ImageIO.read()");                 }                 texture = new Texture(tmpImg);             }             catch ( Exception e ) {                 throw new Exception("Problem loading bitmap", e);             }         } else {             throw new Exception("Error: file name is not valid!");         }         return texture;     }

And it has problems finding bmps, but not pngs.  Is there a reason for this?  And what settings do I need on the png for it to show up?

Thanks.

[Backmask]

http://www.puppygames.net/forums/viewtopic.php?t=73&highlight=png+textures

[nickdotjava]

If I use certain textures, any polygon that's not texture mapped disappears.  Anyone know why this happens?

Thanks.

Games published by our own members! Check 'em out!

[Andrew]

I just had a problem like this.

Are you turning off texture mapping when drawing the other polygons? If not, then all the vertices will inherit the previous texture coord, which could be black - depending on the image - and nothing appears.

[nickdotjava]

What's the line of code to disable texturing?  And where do I put it?  If you can, use the following as an example:

1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28

float[][] triangle1={{20.0f, 30.0f, 200.0f},                                       {20.0f, 40.0f, 0.0f},                                       {60.0f, 30.0f, -20.0f}};         crossProduct=GraphicsUtil.unitCrossProduct(triangle1);         gl.begin(GL.TRIANGLES);               gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);               gl.texCoord2f(0.0f, 0.86f);             gl.vertex3f(20.0f, 30.0f, 200.0f);             gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);             gl.texCoord2f(0.77f, 1.0f);             gl.vertex3f(20.0f, 40.0f, 0.0f);             gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);             gl.texCoord2f(0.88f, 0.86f);             gl.vertex3f(60.0f, 30.0f, -20.0f);         gl.end();         float[][] triangle2={{20.0f, 30.0f, 200.0f},                                       {60.0f, 30.0f, -20.0f},                                       {40.0f, -20.0f, -10.0f}};             crossProduct=GraphicsUtil.unitCrossProduct(triangle2);         gl.begin(GL.TRIANGLES);               gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);               gl.vertex3f(20.0f, 30.0f, 200.0f);               gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);               gl.vertex3f(60.0f, 30.0f, -20.0f);               gl.normal3f(crossProduct[0], crossProduct[1], crossProduct[2]);               gl.vertex3f(40.0f, -20.0f, -10.0f);         gl.end();

I tried putting the line:         gl.disable(GL.TEXTURE_2D);
right after the first gl.end(), but then no textures show up.

Edit:  If I edit it, and press save, then the tabbing on the code fixes itself.

[nickdotjava]

Now it gets really bizarre.  All I did was add a different filter to it on Photoshop, and now everything appears normally.

[Andrew]

I tried putting the line:         gl.disable(GL.TEXTURE_2D);
right after the first gl.end(), but then no textures show up.

It will remember the last state set between frames, so you'll need to enable textures again before drawing any.