﻿ Environment: Drawing

# Environment: Drawing

### Sea surface pen

Determines how the sea surface, current direction arrow and wave direction arrows are drawn. The current direction arrow is an arrow drawn on the view axes which indicates the direction of the current. It is only drawn if the current speed is non-zero and the environment axes preference is selected. The wave direction arrows are described below.

### Secondary wave direction pen

When the environment axes preference is selected, a wave direction arrow is drawn indicating the direction of the wave. If there are multiple wave trains whose directions are not all equal, then a wave direction arrow is drawn for each wave direction. The first wave train uses the sea surface pen: it is regarded as the primary one for drawing purposes. All other direction arrows are drawn with the secondary wave direction pen.

### Wind pen

Determines how the full field wind bounding box and the wind direction arrow is drawn. This arrow is drawn on the view axes to indicate the direction of the wind. This arrow is only drawn if the wind speed is non-zero and the environment axes preference is selected.

### Seabed pen

The seabed grid is drawn in this pen.

### Seabed profile pen

For a profile seabed an extra grid line is drawn through each data point used to specify the profile in the direction normal to the seabed direction. Using a differently-coloured pen to the seabed here will emphasise the seabed profile data.

### Sea surface type

The sea surface may be drawn as a grid or a single line.

### Sea surface and seabed grid density

The density of each grid, in terms of the length of the scale bar on the 3D view; a density of $d$ means that there are $d$ lines per scale bar length, so higher density values give a finer grid (but take longer to draw).

### Draw 3D seabed data points

This options allows you to omit 3D seabed data points from the wire frame drawing, which may speed up the drawing of 3D seabeds with extremely large numbers of data points.

### Shaded drawing sea surface and seabed translucency

Controls how translucent the sea surface and seabed appear in the shaded graphics mode. A value of 0% gives a solid surface; objects behind the surface will not be visible. A value of 100% represents transparency and gives a completely see-through surface.

## Tabular current

### Draw velocity

Draws a vector field of arrows representing the current velocity at the points specified by the tabular current data.

### Draw acceleration

Draws a vector field of arrows representing the current acceleration at the points specified by the tabular current data.

 Note: The velocity and acceleration field drawings only appear once the analysis is underway. This is because the current data needs to be processed and validated before the drawing can be rendered.

## Full field wind

### Draw bounding box

If checked, a 3D box representing the full field wind will be included in the wire frame drawing. If the wind field is periodic, then a series of 3D boxes will be drawn.

### Vector field planes

If draw vector field is checked, arrows representing wind vectors will be drawn for a number of $yz$ planes. Offset is the downwind distance, from the full field wind origin, at which the first $yz$ plane will be drawn. Count determines how many $yz$ planes are to be drawn. If count is greater than one, additional planes are drawn upwind up of the first plane, i.e. along $-x$, separated by the spacing. If the spacing is set to "~", then it is determined from the full field wind data. The separation of the arrows, and the extent of them, within the $yz$ plane is always determined by the data.

### Vector field scale

If draw vector field is checked, the scale is used to determine the size and colour of the arrows drawn. If a value of ~ is given, the mean speed is used to scale the drawing.