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Problem: Inverted texcoords

Started by Max_Payne Aug 2, 2002 at 9:29 PM 2 replies 300+ views

Original Post

Aug 2, 2002 at 9:29 PM

All tutorials i have found represent the texcoords like this: (0,1)---(1,1) | | | (0,0)---(1,0) But when i set the texcoords like that, the Y becomes inverted...., it doesnt make any sense, i tried drawing polygons counter clockwise instead of clockwise but it doesnt change anything...... My textures appear upside down when i specify the texcoords that way, unless i invert the Y axis (all 1 becomes 0, all 0 become 1). I would really like to fix this. does anyone know potential reasons for this bug?

lp23

Aug 2, 2002 at 10:36 PM

Check how you coordinate the texture to the vertex points -

glTexCoord2f(bottom_left_percent_x, bottom_left_percent_y);
glVertex3f(bottom_left_x, bottom_left_y, bottom_left_z);
glTexCoord2f(bottom_right_percent_x, bottom_right_percent_y);
glVertex3f(bottom_right_x, bottom_right_y, bottom_right_z);
glTexCoord2f(top_right_percent_x, top_right_percent_y);
glVertex3f(top_right_x, top_right_y, top_right_z);
glTexCoord2f(top_left_percent_x, top_left_percent_y);
glVertex3f(top_left_x, top_left_y, top_left_z);

Your y glVertex points should probably be reversed in your code. Hope this helps...

Luigi Pino
The 23rd Dimension

ZitherMan

Aug 2, 2002 at 10:36 PM

I belive textures are often drawn upside down? At least the texture i use for my MD2 file is...

Max_Payne

Author

Max_Payne

Aug 3, 2002 at 2:31 AM

Nevermind, i found the problem...... my targa textures are loaded properly, but my bitmap ones are loaded upside down, ill have to get that fixed

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