I have done a scene in opengl where I'm using a third person camera (that I can control with the mouse). Then, inside it, it has the camera of the first view (that I called thirdpersonCamera, see the code above), drawing the camera, the frustum etc..
It looks like this picture:
and I've done with this code:
void GLView::drawSubThirdpersoncamera() { // set perspective viewing frustum in the 3rd person camera thirdpersonCamera.setFrustum(FOV_Y, (float)(W)/(H), NEAR, FAR); // use 3rd person camera projection matrix (the frustum, the perspective etcetera) // as the opengl camera glMatrixMode(GL_PROJECTION); glLoadMatrixf(thirdpersonCamera.projectionMatrix.getTranspose()); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glPushMatrix(); { // First, transform the camera (viewing matrix) from world space to eye space glLoadMatrixf(thirdpersonCamera.viewMatrix.getTranspose()); // translate and rotate the mouse control // (keeping the camera fixed because // we want only the scene to rotate/translate) // for thinking about modern opengl: should be a matrix.. glTranslatef(mousePosition[0], mousePosition[1], mousePosition[2]); glRotatef(mouseAngle[0], 1, 0, 0); // pitch glRotatef(mouseAngle[1], 0, 1, 0); // heading glRotatef(mouseAngle[2], 0, 0, 1); // roll // now the draw the scene drawScene(); // draw the first person camera glPushMatrix(); { glMultMatrixf(physicalCamera.viewMatrix.getTranspose()); drawAxis(4); drawCamera(); drawFrustum(physicalCamera.fovy, physicalCamera.aspectRatio, physicalCamera.near, physicalCamera.far); } glPopMatrix(); } glPopMatrix(); } Now I want to switch to the eye of the camera I've drawn, with this code:
void GLView::drawSubPhysicalCamera() { // use physical camera projection matrix (the frustum, the perspective etcetera) // as the opengl camera glMatrixMode(GL_PROJECTION); glLoadMatrixf(physicalCamera.projectionMatrix.getTranspose()); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glPushMatrix(); { // the view matrix: how the camera is positioned in the world space glLoadMatrixf(physicalCamera.viewMatrix.getTranspose()); drawScene(); } glPopMatrix(); } I think it should go because I'm using the same matrix once for translate the object in the screen, once for translate the camera but.. in the second view I don't see anything.. I don't find any error because the transformation in the space is the same but.. it doen't work..
Where am I wrong?
