Blending -> Black Lines Through Textures (Wireframe like)

Member

Posts: 153
Joined: 2004.12

Post: #1

Apr 5, 2005 — 12:43 AM

Enabling blending makes all my textures have these weird black lines go through them. Kinda like a wireframe, if my mesh where triangulated. Heres a pic: Screenie

Again this only happens when i enable blending.

Iv tried:

Nearly every possible combination of texture filtering.
Changing my materials... enabling/disabling... no change.
Changing the blending function...
Clamping my textures...
enabling mipmaps...
changing the texture enviroment...

Some relevant code:

Code:

//Blending

    glEnable(GL_BLEND);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

Code:

//texture generation

        glBindTexture(GL_TEXTURE_2D, textureId);

        glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);

        glTexImage2D( GL_TEXTURE_2D, 0, 3, size.width,

                    size.height, 0, glFormat,

                    GL_UNSIGNED_BYTE, bytes );

        // Linear filtering

        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );

        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );

        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );

        glTexEnvi(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, -3);

        glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);

Code:

//Model Rendering

    if([textures count])

        glBindTexture(GL_TEXTURE_2D, [[textures objectAtIndex:0] tId]);

    else

        glBindTexture(GL_TEXTURE_2D, 0);

    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  [mat get:LC_DIFFUSE]);

    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  [mat get:LC_AMBIENT]);

    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, [mat get:LC_SPECULAR]);

    glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, [mat get:LC_EMISSIVE]);

    [self calculateAbsoluteVertices];

    glMultMatrixf((GLfloat*)finalMatrix);

    if([self useVertexArrays])

    {   

        glVertexPointer(3,GL_FLOAT,0,vertices);

        glNormalPointer(GL_FLOAT,0,normals);

        glTexCoordPointer(2,GL_FLOAT,0,uvVertices);

        glDrawArrays(drawType,0,nPoints);

    } else {

Thanks in advanced.
-Joe

There was a long silence...
'I claim them all,' said the Savage at last.

hangt5

Member

Posts: 153
Joined: 2004.12

Post: #2

Apr 5, 2005 — 01:01 AM

if i disable materials/textures it still happens...

EDIT: Having glEnable(GL_POLYGON_SMOOTH); was doing it. So my question becomes... Is there anyway to use Polygon smoothing and blending at the same time?

There was a long silence...
'I claim them all,' said the Savage at last.

ThemsAllTook

Moderator

Posts: 1,552
Joined: 2003.10

Post: #3

Apr 5, 2005 — 05:06 AM

hangt5 Wrote:Having glEnable(GL_POLYGON_SMOOTH); was doing it. So my question becomes... Is there anyway to use Polygon smoothing and blending at the same time?

Sadly, no. See Arekkusu's explanation in this thread.

- Alex Diener

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Blending -&gt; Black Lines Through Textures (Wireframe like)

Blending -> Black Lines Through Textures (Wireframe like)