I have a Problem with Blending. I made a landscape Engine. In the middle of the landscape tere is water. Now I wanted to make the water translucend. So I turn on blending every time when he draws the water. The water is translucend now BUT I can see the water at every Time. throuh every terrain and Mountain what must I do to fix it.

i guess you use OpenGL, if not, you''ll have to translate my pseudocode ;Þ

first draw your landscape, only the non transparent faces, with blending off, depth buffer read on / write on
secondly draw your water, with blending on, depth buffer read on / write off

here''s the pseudocode :

glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);

while(something)
{
glDepthMask(1); // read on / write on

glDisable(GL_BLEND);
draw_solid();

glDetphMask(0); // read on / write off
glEnable(GL_BLEND);
draw_water();
}


this should draw your landscape correctly, if i correctly understood your question ..

flure

Yes you understood my problem correctly.
I forgot ti set the glDetphMask(0);
now it should work
I will try it

now it works!
thx

Now my water is translucend.
But is is very brigth how can I make it darker?

Try to dark the water polygons with a call to glcolor(..)

Bruno

hi everybody, since i''m doing the same stuff of Billi, i tried the advise you gave him , so I made a big blue transparent plane across the map, but the problem is that blending is messed up: where surface and water intersect i get nasty artifacts (blending problem i guess): this is my code from the DrawGLScene()

glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);

glDepthMask(1);
glDisable(GL_BLEND);
draw_surface();

glDetphMask(0);
glEnable(GL_BLEND);
draw_water();
}

what am i doing wrong ?