PRESENT OPTIONS VECTORS Control [Range]

        

The `PRESENT OPTIONS VECTORS' command allows the user to control the colour modulation of, and to select different styles for, the vectors displayed via the `PRESENT VECTORS' command.

Control Range Comments

MODULATE ALL Controls the number of colours used for colour modulation. Number OFF

NOHEADS Selects a line representation for vectors. This is the default condition.

2DHEADS Selects a two-dimensional arrow head representation for vectors.

3DHEADS Selects a three-dimensional arrow head representation for vectors (see note 3).

Notes:

1.

Colours Used for Modulation
The default condition is that 3 colours will be used, so that high values will be in red, mid-range values green, and low values blue. If colour modulation with other than 3 colours is selected, then vectors will be coloured according to result value, so that vectors will be in red where the values are highest through to blue where they are lowest.

2.

Default Vector Style
The default condition is that a simple line representation will be used for vectors.

3.

3-D Arrow Heads
Each vector is given a solid square based pyramid arrow head. One side of the base is always displayed in the plane of the screen with a length proportional to the in-plane magnitude whilst the adjacent side is in the same proportion to the out-of-plane magnitude. The overall length of the vector, plus arrow head, is the same as for a LINES or 2DHEADS representation. Note that a LINES representation will be drawn if the 3-D head would be too small.

4.

Notation for principal stresses
Positive principal stresses are shown by a simple vector and negative principal stresses are denoted by bars at the ends of the vector.

Arrow heads are not drawn with principal stresses and the commands PRESENT OPTIONS VECTORS 2DHEADS, PRESENT OPTIONS VECTORS 3DHEADS and PRESENT OPTIONS VECTORS NOHEADS have no effect.

Examples:

1.

PRESENT OPTIONS VECTORS MODULATE 12

Selects 12 colours for modulation of vectors.

2.

PRESENT OPTIONS VECTORS 2DHEADS

A two dimensional arrow head representation will be used for vectors.

3.

PRESENT OPTIONS VECTORS 3DHEADS

A three dimensional arrow head representation will be used for vectors.

See also the following commands

'PRESENT VECTORS'