To Render a Blowup

1. Open the Rendered Frame Window and choose the viewport to render.
2. Choose Blowup from the Area To Render list.

   (Edit Region) button appears on the Rendered Frame Window, to the right of the Area To Render list, and the Blowup region window is displayed in the active viewport. This window is different from the one used for Region and Crop.

   The Blowup region window does not appear in the Rendered Frame Window because the region extents might exceed the window area, depending on the rendering history.

3. To move the window, drag inside it. To adjust the window size, drag its handles.

   The window is constrained to the aspect ratio of the current output size.

4. Render the scene.

   3ds Max displays a progress dialog that shows the progress of rendering and the rendering parameter settings. To stop rendering, click Cancel in this dialog, or press Esc.