Main toolbar > Render Type drop-down list
The Render Type list lets you specify the portion of the scene that will be rendered.
To render selected objects:
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From the Render Type drop-down list at the right end of the toolbar, choose Selected.
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Click Render Scene or Quick Render (Production).
Autodesk VIZ 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.
To render a region:
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Click Render Scene or Quick Render (Production).
A window is displayed in the active viewport, and an OK button appears in the viewport's lower-right corner.
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Drag in the middle of the window to move it. Drag the window's handles to adjust its size.
To preserve the window's aspect ratio, you can hold down Ctrl while you drag a handle.
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Autodesk VIZ 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.
To render a blowup:
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Click Render Scene or Quick Render (Production).
A window is displayed in the active viewport and an OK button is displayed in the viewport's lower-right corner.
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Drag in the middle of the window to move it. Drag the window's handles to adjust its size.
The window is constrained to the aspect ratio of the current output size.
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Autodesk VIZ 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.
View—(The default.) Renders the active viewport.
Selected—Renders the currently selected object or objects only, and leaves the remainder of the rendered frame window intact.
Tip: 
Use the Clear button before rendering to remove any existing image from the window.
Region—Renders a region within the active viewport, and leaves the remainder of the rendered frame window intact. Use this option when you need to test render a part of the scene.
Tip: Use the Clear button before rendering to remove any existing image from the window.
Note: Region rendering is meant to create a draft rendering of a selected area of a view. As such, Region rendering uses only an Area filter for antialiasing, regardless of which antialiasing is chosen in the Render Scene dialog.
Crop—Lets you specify the size of the output image using the same region box that appears for the Region and Blowup categories.
Blowup—Renders a region within the active viewport and enlarges it to fill the output display.
A rectangular selection region appears when you render with either Blowup or Region selected in the Render Type list. You can change the size of the region by dragging its handles.
Box Selected—Calculates the aspect ratio of the current selection’s bounding box, and then displays the Render Bounding Box/Selected dialog, which lets you specify a width and height for the rendering, and provides the option of maintaining the aspect ratio.
Region Selected—When an object or objects are selected, renders those objects and other objects within the selection's bounding boxes, but does not change the rendering outside the bounding boxes.
Objects within the bounding boxes, including objects in front of or behind the selection, are rendered.
When no objects are selected, Region Selected renders the entire frame.
Crop Selected—When an object or objects are selected, renders those objects and other objects within the selection's bounding boxes. The rendering is cropped around the region defined by the bounding boxes.
Objects within the bounding boxes, including objects in front of or behind the selection, are rendered.
When no objects are selected, Crop Selected renders the entire frame.