Select an Object In OpenGL

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I draw one cube and one sphere. I load the cube's name but don't load the sphere's name. When I select the sphere by cursor, The program shows the cube's name. The code like this:

C#

glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Translate the whole scene out and into view
glTranslatef(-80.0f, 0.0f, -300.0f);
// Initialize the names stack
glInitNames();
glPushName(0);
// Set material color, Yellow
// Cube
glRGB(255, 255, 0);
glLoadName(CUBE);
glutSolidCube(75.0f);

// Draw Sphere
glRGB(128,0,0);
glTranslatef(120.0f, 0.0f, 0.0f);
glutSolidSphere(50.0f, 15, 15);

glRGB(128,0,0);
glTranslatef(0.0f, -80.0f, 0.0f);
glutSolidSphere(20.0f, 15, 15);
// Restore the matrix state
glPopMatrix();  // Modelview matrix

Posted 4-Sep-11 15:06pm

wjcsj

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Santhosh G_ · Answer 1 · 2011-09-05T07:38:00

Could you please try like this.

Here CUBE name is given to glutSolidCube and SPHERES name is given to sphere drawing.
Now you will get SPHERES on picking sphere objects in screen.

C#

// Set material color, Yellow
// Cube
glRGB(255, 255, 0);
// Set Drawing object name to CUBE
glLoadName(CUBE);
glutSolidCube(75.0f);

// Set Drawing object name to SPHERES
glLoadName(SPHERES);
// Draw Sphere
glRGB(128,0,0);
glTranslatef(120.0f, 0.0f, 0.0f);
glutSolidSphere(50.0f, 15, 15);

// Other drawing..........