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visage_probe(visage) Scientific Visualizationvisage_probe(visage)

NAME

visage_probe - VISAGE object to interpolate scalar and vector data

DESCRIPTION

The visage_probe object takes as input a visage_data_set and a point location and on output draws a text string with the scalar and vector values at that point.

SUPERCLASS

visage_computed_feature

INSTANCE VARIABLES

position the position of the probe point in global x,y,z coordinates.

location the location of the probe point in data coordinates, i.e., i,j,k for structured grids and structured point sets, and element number for unstructured grids.

MESSAGES

position= (x,y,z) Set the global x,y,z coordinates of the probe.

position? Get the global x,y,z coordinates of the probe.

location= (i,j,k) Set the data coordinates of the probe.

location? Get the data coordinates of the probe.

unstructured_grid_set: data_set_object Display an probe for the unstructured grid provided by the visage_data_set object data_set_object. Note that data_set_object is a pointer to the object, hence this message is only used internally.

structured_grid_set: data_set_object Display a probe for the structured grid provided by the visage_data_set object data_set_object. Note that data_set_object is a pointer to the object, hence this message is only used internally.

unstructured_point_set: data_set_object Display a probe for the unstructured point set provided by the visage_data_set object data_set_object. Note that data_set_object is a pointer to the object, hence this message is only used internally.

structured_point_set: data_set_object Display a probe for the structured point set provided by the visage_data_set object data_set_object. Note that data_set_object is a pointer to the object, hence this message is only used internally.

tagus: data_set_object Display a probe for the tagus geometry provided by the visage_data_set object data_set_object. Note that data_set_object is a pointer to the object, hence this message is only used internally.

renderer_names? Get the name of the renderers used to draw the display. Used internally.

EXAMPLE

/* * Create VISAGE data group hierarchy consisting of a single data * group, a single data set, and an outline, geometry, and iso-surfaec * display. */ visage_data_group new: data_group data_sets=data_set_1 ;

visage_data_set new: data_set_1 displays=(border,p1) geometry= grid scalar_data= pressure vector_data= velocity ;

visage_outline new: border color=(1,0,0) ; visage_probe new: p1 location=(1,1,1) ; /* * Create data for data set. Can also use various readers to read * the data. */ /* * Create structured grid geometry. Points are xyz ordered: i * varies fastest, then j, then k. */ structured_grid_set new: grid dimensions= (2,3,4); grid data=(0., 0., 0., 1., 0., 0., 0., 1., 0., 1., 1., 0., 0., 2., 0., 1., 2., 0.) data+(0., 0., 1., 1., 0., 1., 0., 1., 1., 1., 1., 1., 0., 2., 1., 1., 2., 1.) data+(0., 0., 2., 1., 0., 2., 0., 1., 2., 1., 1., 2.,

0., 2., 2., 1., 2., 2.) data+(0., 0., 3., 1., 0., 3., 0., 1., 3., 1., 1., 3., 0., 2., 3., 1., 2., 3.) ; /* * Vector data. Must correspond exactly to grid points. */ visage_vector new: velocity; velocity data= (0., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (1., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (2., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (2., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (2., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (3., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) ; /* * Scalar data */ visage_scalar new: pressure; pressure data=(0., 0., 0., 1., 0., 0., 0., 2., 0., 0., 0., 3.) data+ (1., 1., 1., 2., 1., 1., 3., 2., 1., 1., 1., 3.) ;

/* * Set up image */ actor new: rock modeller=data_group ;

collection new: data members=([visage_data instances?]) compute_properties! ; vector new: bbox dimension=6; bbox = ([grid bbox?]); camera new: acamera position= (1,1,1) focal_point= ([grid center?]) x_range=([bbox @1 ?],[bbox @2 ?]) y_range=([bbox @3 ?],[bbox @4 ?]) z_range=([bbox @5 ?],[bbox @6 ?]) default! zoom: 1.4 on! ; light new: alight position= ([acamera position?]) on! ; /* * Create renderer */ logic new: _test;

environment new: _env variable="LYMB_RENDERER"; _test = [_env defined?] false: "#Environment variable LYMB_RENDERER must be set." false: "parser exit!;" ; string new: current_renderer = [_env value?];

object# current_renderer new: main_renderer actors=([actor instances?]) lights=alight cameras=acamera ; /* * Draw the picture */ main_renderer render!;