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An [i]image overlay[/i] is a bitmap image that can be made visible on top of the geometry editor, to use as a spatial reference, for tracing, to use as a stencil brush, or other purposes. Each overlay image can either be visible from all angles, or only visible from a specific camera angle.

The Image Overlays window is used to add, remove, or edit image overlays. Global controls:
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[*]Alpha: Overall opacity of all image overlays.
[*]Add: Click to browse for an image file on disk, to be added to the document as a new image overlay.
[*]Show: Global toggle for image overlay visibility. Individual image overlays can also be hidden separately from the others.
[*]Draw in Front: If checked, image overlays will be drawn on top of model geometry. If unchecked, model geometry will be drawn on top of image overlays.
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Each overlay image also has its own set of controls:
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[*]Visible: Whether to show or hide the image. Both Show and Visible checkboxes must be checked for an overlay to be visible.
[*]Set: Defines the geometry view's current camera angle as the exclusive viewing angle for the image. After setting a camera angle, the overlay will be automatically hidden when the model is viewed from any other camera angle.
[*]Clear: Unbinds the overlay from a previously established camera angle, allowing it to be seen from all angles.
[*]Show: Reorients the geometry view's camera to the overlay's camera angle.
[*]S: Selects the image overlay to be used as a stencil for [link=texture_drawing]texture drawing[/link].
[*]Size: Overall scale of the overlay image, relative to geometry view height.
[*]Ratio: Aspect ratio of the image, relative to its base width.
[*]Rotation: Angle of image rotation in degrees, relative to its center. Positive values rotate counterclockwise.
[*]X: Horizontal offset of the image, in world units from the origin.
[*]Y: Vertical offset of the image, in world units from the origin.
[*]Flip X: Adjusts the overlay's ratio setting to flip the image horizontally while otherwise preserving its current transformation.
[*]Flip Y: Adjusts the overlay's rotation and ratio settings to flip it vertically while otherwise preserving its current transformation.
[*]Replace: Prompts for a file to replace the current image with a different file from disk, while preserving all of its attributes.
[*]Remove: Deletes the image overlay from the document.
[*]Nearest Neighbor: Determines filter mode used when drawing the image. Check for crisp, rectangular pixels; leave unchecked for smoothing.
[*]Flipped: Determines whether the image file containing the overlay has a coordinate system starting at the bottom or the top. This differs from Flip Y in that it also affects the thumbnail seen in the Image Overlays window.
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