Method drawCubes

octovis/src/OcTreeDrawer.cpp:752–838

  }

  void OcTreeDrawer::drawCubes(GLfloat** cubeArray, unsigned int cubeArraySize,
                               GLfloat* cubeColorArray) const {
    if (cubeArraySize == 0 || cubeArray == NULL){
      std::cerr << "Warning: GLfloat array to draw cubes appears to be empty, nothing drawn.\n";
      return;
    }

    // save current color
    GLfloat* curcol = new GLfloat[4];
    glGetFloatv(GL_CURRENT_COLOR, curcol);

    // enable color pointer when heightColorMode is enabled:

    if ((m_colorMode == CM_COLOR_HEIGHT || m_colorMode == CM_GRAY_HEIGHT) && (cubeColorArray != NULL)){
      glEnableClientState(GL_COLOR_ARRAY);
      glColorPointer(4, GL_FLOAT, 0, cubeColorArray);
    }

    // top surfaces:
    glNormal3f(0.0f, 1.0f, 0.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[0]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);
    // bottom surfaces:
    glNormal3f(0.0f, -1.0f, 0.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[1]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);
    // right surfaces:
    glNormal3f(1.0f, 0.0f, 0.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[2]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);
    // left surfaces:
    glNormal3f(-1.0f, 0.0f, 0.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[3]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);
    // back surfaces:
    glNormal3f(0.0f, 0.0f, -1.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[4]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);
    // front surfaces:
    glNormal3f(0.0f, 0.0f, 1.0f);
    glVertexPointer(3, GL_FLOAT, 0, cubeArray[5]);
    glDrawArrays(GL_QUADS, 0, cubeArraySize / 3);

    if ((m_colorMode == CM_COLOR_HEIGHT || m_colorMode == CM_GRAY_HEIGHT)
        && (cubeColorArray != NULL)){
      glDisableClientState(GL_COLOR_ARRAY);
    }

    // draw bounding linies of cubes in printout:
    if (m_colorMode == CM_PRINTOUT){
      glDisable(GL_LIGHTING);
      glHint (GL_LINE_SMOOTH_HINT, GL_NICEST);
      glEnable (GL_LINE_SMOOTH);
      glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);   // Draw Polygons only as Wireframes
      glLineWidth(2.0f);
      glColor3f(0.0f, 0.0f, 0.0f);
      glCullFace(GL_FRONT_AND_BACK);        // Don't draw any Polygons faces
      //glDepthFunc (GL_LEQUAL);