Question

当我尝试放置我的项目并在笔记本电脑上运行时，一切正常，但3D拾取混乱了。单击3D对象时，它会选择不同的对象。

我在另一台笔记本电脑上尝试过它会产生相同的效果。然后我尝试将台式电脑的显示器固定到我的笔记本电脑上，以查看天气是一个分辨率问题。但它仍然给出了相同的结果。但它在我的台式电脑上完全正常。

我的桌面上有一个Nvidia 760gtx gpu，笔记本电脑只有Intel HD 4500 gpu。是因为gpu吗？我。我输了。我尝试了一切。这是我选择3D对象的代码。

public void select(int xx, int yy )
{
        // The selection buffer
        IntBuffer selBuffer = ByteBuffer.allocateDirect(1280).order(ByteOrder.nativeOrder()).asIntBuffer();
        int buffer[] = new int[256];

        IntBuffer vpBuffer = ByteBuffer.allocateDirect(64).order(ByteOrder.nativeOrder()).asIntBuffer();
        // The size of the viewport. [0] Is <x>, [1] Is <y>, [2] Is <width>, [3] Is <height>
            int[] viewport = new int[4];

        // The number of "hits" (objects within the pick area).
        int hits;
        // Get the viewport info
            GL11.glGetInteger(GL11.GL_VIEWPORT, vpBuffer);
            vpBuffer.get(viewport);


        // Set the buffer that OpenGL uses for selection to our buffer
        GL11.glSelectBuffer(selBuffer);

        // Change to selection mode
        GL11.glRenderMode(GL11.GL_SELECT);

        // Initialize the name stack (used for identifying which object was selected)
        GL11.glInitNames();
        GL11.glPushName(0);

        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glPushMatrix();
        GL11.glLoadIdentity();

        /*  create 5x5 pixel picking region near cursor location */
        GLU.gluPickMatrix( (float) xx, (float) yy, 0.001f, 0.001f,IntBuffer.wrap(viewport));

        GLU.gluPerspective(fov, screenResolutionx/screenResolutiony, near, far);
        render();
        GL11.glPopMatrix();
        // Exit selection mode and return to render mode, returns number selected
        hits = GL11.glRenderMode(GL11.GL_RENDER);
        System.out.println("hits: " + hits);

        selBuffer.get(buffer);
            // Objects Were Drawn Where The Mouse Was

            if (hits > 0) {
                  // If There Were More Than 0 Hits
                  choose = buffer[3]; // Make Our Selection The First Object
                  int depth = buffer[1]; // Store How Far Away It Is
                  for (int i = 1; i < hits; i++) {
                        // Loop Through All The Detected Hits
                        // If This Object Is Closer To Us Than The One We Have Selected
                        if (buffer[i * 4 + 1] <  depth) {
                              choose = buffer[i * 4 + 3]; // Select The Closer Object
                              depth = buffer[i * 4 + 1]; // Store How Far Away It Is
                        }
                  }
                  System.out.println("Chosen: " + choose);
            }




}

Answer 1

最后我想通了。这是因为GPU。我在nvidia GPU（840m）笔记本电脑上尝试了这种方法，它确实运行良好。但是当我将gpu切换到Intel HD 5500时，选择无法正常工作。所以我的结论是使用GL11.glRenderMode(GL11.GL_SELECT)方法进行3D对象选择仅适用于nvidia GPU。它可能适用于ATI GPU（未经测试），但不适用于英特尔。

3D拾取不适用于另一台计算机 - lwjgl

1 个答案: