INDEX
NVIZ - Surfaces
Use Surface panel options to manage surfaces
to be drawn. The top half of the panel contains options for drawing
style. The bottom half is used to add and delete surfaces and change
attributes on the current surface. After options are set, click on
Surface in the Movement panel to
see the results.
- Grid Resolution
- sets number of cells between grid lines when drawing wire grids
(in both fast display mode and
Draw mode). A larger grid resolution number
produces a more sparse grid.
- Poly Resolution
- sets number of cells to be used as dimensions of each polygon
drawn when drawing polygons. Each drawn polygon actually represents
(Poly Res x Poly Res) cells.
- Current Surface Only
- Option changes effect currently selected surface only.
- All Surfaces
- Option changes effect all surfaces.
- Surface Style
-
- Polygon
- draw surface using filled polygons (most realistic).
- Wire
- draw surface with a wire mesh. This differs from the
mesh drawn in fast display mode in that hidden lines
are not drawn.
- Wire/Poly
- draw surface as polygons, but with wire mesh draped over it.
- Shading
-
- Gouraud
- smooth shade surface to blend individual cell colors together.
- Flat
- Surfaces are drawn with flat shading. One color for each
of the two triangles that form a cell. The surface will appear faceted.
- Current
- displays name of currently selected surface. Pressing the left
mouse button over the name causes a menu of all available surfaces to
appear. A new current surface can be selected from this menu.
- New
- Load a new surface. This button pops up a Change
Attribute window (see below) which allows the selection
of a new map or constant for a surface.
- Delete
- Delete current surface. This merely unloads surface data.
nviz will not change any files that exist in your
GRASS database.
- No Zeros
- do not draw surface where elevation data values are zero. The
second No Zeros toggle causes areas where the color
values are zero not to be drawn.
- Wire Color
- Select a wire color for current surface with a Select
Color popup (see below).
- Position
- change x, y, and z position of current surface using
Position Surface popup window (see below).
- Draw Current
- render only the current surface using the given rendering
parameters.
The rest of the buttons on this panel control attributes of the
current surface. The current value of that attribute appears to the
right of the attribute button. Clicking on an attribute button pops up
a Change Attribute window (see below) which allows
the selection of a new map or constant for that attribute.
- Topography
- Map or constant which controls elevation (z values) of surface.
- Color
- Map or constant which controls surface color.
- Mask
- Map or constant which controls which areas of surface are drawn.
- Transparency
- Map or constant which controls transparency level of surface (all
opaque is default).
- Shininess
- Map or constant which controls shininess (reflectivity) of
surface material.
- Emission
- Map or constant which controls light emitted from surface.