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Blender Documentation
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The ViewButtons

These buttons are not global; independent variables can be set for each 3Dwindow independently, for the grid or the lens, for example. Use the HotKey SHIFT+F7 in the 3DWindow or the WindowType button in the 3DHeader.

Use SHIFT+F5 to restore the 3DWindow.

BackGroundPic

This option displays a picture in the background of the 3DWindow. Standard Image blocks are used; re-using an Image does not consume any additional memory. The BackGroundPic is only drawn in ortho and Camera view. It is always centered around the global nulpoint. In camera View, it is completely displayed in the viewport.

Size:

The size in Blender units for the width of the BackGroundPic. Only of interest in ortho.

ImageBrowse

Select an existing Image from the list provided.

LOAD

The window changes into an ImageSelectWindow. Use this to specify the picture to be used as the BackGroundPic. The picture is added to the Blender structure as an Image block.

Blend

The factor with which the grey of the 3DWindow is blended with the background picture.

TextureBrowse

Specify a Texture to be used as the BackGroundPic. This only works for Image Textures. The TextureButtons have extensive options for an animated Image Texture, which allows you to achieve an animated BackGroundPic. Use this option for rotoscoping, for example. This is a technique in which video images are used as examples or as a basis for 3D animation.

Grid:

The distance between two grid lines. This value is also used to define minimum and maximum values for several buttons in Blender.

GridLines:

The number of lines that comprise the grid in perspective or Camera view. A value of zero means no grid at all.

Lens:

The 'lens' used for the perspective view. This is independent of the Camera.

ClipStart:

The start clipping value in perspective view mode.

ClipEnd:

The distance beyond which items are no longer displayed in perspective view mode. The ClipStart and ClipEnd limits also determine the resolution (actually the density) of the OpenGL zbuffer. Try to keep these values as close together as possible, so that the zbuffer can distinguish small differences.

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