Object Selection

Specifies objects to use in the preview image as you change views. Selecting too many
objects slows image dragging and updating.

DVIEWBLOCK

If you press Enter at the Select Objects prompt, DVIEWBLOCK displays a preview image.
You can create your own DVIEWBLOCK block in a 1 unit by 1 unit by 1 unit area, with
its origin at the lower-left corner. The following illustration shows an example of
using the default DVIEWBLOCK to set the view (moving the graphics cursor adjusts the
view).

Point Specification

Rolls the view under the camera. The point you select with your pointing device is
a start point for the dragging operation. Your viewing direction changes about the
target point as you move the pointing device.

The angles must be positive. The direction angle indicates the front of the view,
and the magnitude angle determines how far the view rolls.

Camera

Specifies a new camera position by rotating the camera about the target point. Two
angles determine the amount of rotation.

Camera Location

Sets the camera’s position based on the specified point.

Enter Angle from the XY Plane

Sets the camera’s position at an angle above or below the XY plane. An angle of 90 degrees looks down from above, and an angle of -90 looks up
from below. A camera angle of 0 degrees places the camera parallel to the XY plane of the user coordinate system (UCS).

Toggle (Angle In)

Switches between two angle input modes. Entering an angle at the Command prompt locks
the cursor movement so you see only the positions available for that angle. Toggle
unlocks the cursor movement for the angle, and you can use the cursor to rotate the
camera.

Enter Angle in XY Plane from X Axis

Sets the position at an angle in the XY plane relative to the X axis of the current UCS. This angle measures from -180 to 180 degrees. A rotation
angle of 0 degrees looks down the X axis of the UCS toward the origin.

The illustration shows the camera rotating to the left from its initial position,
leaving its angle from the XY plane unchanged.

Toggle (Angle From)

Switches between two angle input modes. Entering an angle at the Command prompt locks
the cursor movement so you see only the positions available for that angle. Toggle
unlocks the cursor movement for the angle, and you can use the cursor to rotate the
camera.

Target

Specifies a new position for the target by rotating it around the camera. The effect
is like turning your head to see different parts of the drawing from one vantage point.
Two angles determine the amount of rotation.

Enter Angle from the XY Plane

Enter Angle from the XY Plane

Toggle (Angle In)

Toggle (Angle In)

Enter Angle in XY Plane from X Axis

Enter Angle in XY Plane from X Axis

The illustration shows the effect of moving the target point from left to right, leaving
its angle from the XY plane unchanged.

Toggle (Angle From)

Toggle (Angle From)

Distance

Moves the camera in or out along the line of sight relative to the target. This option
turns on perspective viewing, which causes objects farther from the camera to appear
smaller than those closer to the camera. A special perspective icon replaces the coordinate
system icon. You are prompted for the new camera-to-target distance.

A slider bar along the top of the drawing area is labeled from 0x to 16x, with 1x
representing the current distance. Moving the slider bar to the right increases the
distance between camera and target. Moving it to the left decreases that distance.
To turn off perspective viewing, click the Off option from the main DVIEW prompt.

If the target and camera points are close together, or if you specify a long-focal-length
lens, you might see very little of your drawing when you specify a new distance. If
you see little or none of your drawing, try the maximum scale value (16x) or enter
a large distance. To magnify the drawing without turning perspective viewing on, use
the Zoom option of DVIEW.

The illustration shows the effect of moving the camera along the line of sight relative
to the target, where the field of view remains constant.

Points

Locates the camera and target points using X,Y,Z coordinates. You can use XYZ point filters.

To help you define a new line of sight, a rubber-band line is drawn from the current
camera position to the crosshairs. You are prompted for a new camera location.

A rubber-band line connects the target point to the crosshairs to help you place the
camera relative to the target. The illustration shows the change in view as you swap
the camera and target points. Lens and distance settings are the same in each case.

For information about entering direction and magnitude angles, see Point Specification.

Pan

Shifts the image without changing the level of magnification.

Zoom

If perspective viewing is off, dynamically increases or decreases the apparent size
of objects in the current viewport.

A slider bar along the top of the drawing area is labeled from 0x to 16x, with 1x
representing the current scale. Moving the slider bar to the right increases the scale.
Moving it to the left decreases the scale.

If perspective viewing is on, Zoom adjusts the camera lens length, which changes the
field of view and causes more or less of the drawing to be visible at a given camera
and target distance. The default lens length is 50mm, simulating what you’d see with
a 35mm camera and a 50mm lens. Increasing the lens length is similar to switching
to a telephoto lens. Decreasing the lens length widens the field of view, as with
a wide-angle lens.

A slider bar along the top of the drawing area is labeled from 0x to 16x, with 1x
representing the current lens length. Moving the slider bar to the right increases
the lens length. Moving it to the left decreases the lens length.

Twist

Twists or tilts the view around the line of sight. The twist angle is measured counterclockwise,
with 0 degrees to the right.

Clip

Clips the view, obscuring portions of the drawing that are behind or in front of the
front clipping plane. The front and back clipping planes are invisible walls that
you can position perpendicular to the line of sight between the camera and target.

Back

Obscures objects located behind the back clipping plane.

• Distance from Target. Positions the back clipping plane and turns on back clipping. A positive distance
  places the clipping plane between the target and the camera. A negative distance places
  it beyond the target. You can use the slider bar to drag the clipping plane.
• On. Turns on back clipping at the current clipping distance.
• Off. Turns off back clipping.

Front

Obscures objects located between the camera and the front clipping plane.

• Distance from Target.Positions the front clipping plane and turns on front clipping. A positive distance
  places the clipping plane between the target and the camera. A negative distance places
  it beyond the target. You can use the slider bar to drag the clipping plane.
• Eye. Positions the front clipping plane at the camera.
• On. Turns on front clipping. This option is available only when perspective viewing is
  off.
• Off. Turns off front clipping. This option is available only when perspective viewing is
  off.

Off

Turns off front and back clipping. If perspective viewing is on, front clipping remains
on at the camera position.

Hide

Suppresses hidden lines on the selected objects to aid in visualization. Circles,
solids, traces, regions, wide polyline segments, 3D faces, polygon meshes, and the
extruded edges of objects with nonzero thickness are considered to be opaque surfaces
that hide objects. This hidden line suppression is quicker than that performed by
HIDE, but it can’t be plotted.

Off

Turns off perspective viewing. The Distance option turns on perspective viewing.

Undo

Reverses the effects of the last DVIEW action. You can undo multiple DVIEW operations.