Iphone iOS OpenGL ES 2.0多织物贴花是半透明的

我有一个函数，可以添加我映射纹理的公告牌四边形。该纹理在旋转时围绕3D球体移动。我的drawInRect如下所示：

- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{

    // Clear the buffer and prepare to draw
    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Enable the Earth texture
    self.effect.texture2d0.name = _earthInfo.name;
    self.effect.texture2d0.target = _earthInfo.target;

    // Bind the earth vertex array
    glBindVertexArrayOES(_earthVertexArray);

    // Render the object with GLKit
    [self.effect prepareToDraw];

    // Draw elements from the index array and uv / vertex / normal info
    glDrawElements(GL_TRIANGLES,Earth_polygoncount*3,GL_UNSIGNED_SHORT,0);

    // Draw the SkyBox -- Draw skybox centered on eye position
//    _skyboxEffect.center = _eyePosition;
//    _skyboxEffect.transform.projectionMatrix = self.effect.transform.projectionMatrix;
//    _skyboxEffect.transform.modelviewMatrix = self.effect.transform.modelviewMatrix;
//    [_skyboxEffect prepareToDraw];
//    [_skyboxEffect draw];

    // Turn on Blending before displaying satellites
    // so that the satellite image ( which has alpha )
    // shows up OK
    glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);

    // Now billboard something
    [self createBillboardAtLat:35 andLon:-97];

    // Now billboard something
    [self createBillboardAtLat:0 andLon:0];

    // Now billboard something
    [self createBillboardAtLat:-65 andLon:-137];

}

在createBillboardAt函数中，我绘制如下：

// Create a billboard that always faces the camera
- (void)createBillboardAtLat:(float)lat andLon:(float)lon {

    ... Do stuff ....

    // Assign the new matrix to draw with - no translation
    self.effect.transform.modelviewMatrix = noTranslationInfo;

    // Render the object with GLKit
    [self.effect prepareToDraw];

    // Draw elements from the index array and uv / vertex / normal info
    glDrawElements(GL_TRIANGLES,Billboard_polygoncount*3,GL_UNSIGNED_SHORT,0);

    // Restore the original matrix
    self.effect.transform.modelviewMatrix = originalMat;

}

在添加广告牌之前，我打开了混合功能，但在某些方向上，hte卫星的纹理与地球很好地混合，但彼此之间没有。请看截图。。。我做错了什么

我已经尝试了所有这些选择，但都没有成功——只有一颗（最前面的）卫星使其他卫星中的一颗黯然失色——不是两颗都有。请帮忙

    // Turn on Blending before displaying satellites
    // so that the satellite image ( which has alpha )
    // shows up OK
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);
    //glEnable(GL_DEPTH_TEST);
    //glDepthFunc(GL_LEQUAL);
    //glDepthMask(true);

---

看起来像深度缓冲区问题。也许上图中较小的卫星绘制得较晚，但深度较远？您的混合函数似乎与您尝试制作的有点不符。。请尝试将其切换为glBlendFunc（GL_SRC_ALPHA，GL_ONE_减去GL_SRC_ALPHA）；并报告问题是否已解决。否更改为：glBlendFunc（GL_SRC_ALPHA，GL_ONE_减去_SRC_ALPHA）；没有解决问题。你们还有其他想法吗？