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Show_Normal


Functions

void Show_Normal (float *x, float *y, float *z)
void Show_Net_Normal (float *x, float *y, float *z)

Function Documentation

void Show_Normal ( float *  x,
float *  y,
float *  z 
)

Returns the normal for the currently open vertex or face.

Parameters:
x X-coordinate of the current normal of a face, edge, or vertex.
y Y-coordinate of the current normal of a face, edge, or vertex.
z Z-coordinate of the current normal of a face, edge, or vertex.

DETAILS

Show_Normal can only be called on a currently-open face or vertex. If your program has not explicitly set a normal value, you will get a complaint. Use Show_Net_Normal() rather than Show_Normal to retrieve the internal HOOPS normal calculation.

NOTES

The Show_Normal routines return the actual attribute values stored in the particular segment at hand. The Show_Net_Normal routines return the effective attribute value for the specified segment. The distinction is that there may or may not be an "actual" stored value for an attribute for a given segment, but there is guaranteed always to be an effective value for every attribute for every segment. Also, "Show Net" will return the cumulative effects of those attributes that concatenate as you go up and down the segment tree (Modelling Matrices and Windows).

When the value being passed back is a string, be sure you've declared your string variable to be long enough.

In C, "passed by reference" means that you have to allocate an appropriate variable, either statically or off the stack, and pass a pointer to that variable to the HOOPS routine. To generate a pointer to a variable C, you prefix the variable with a "&". In other languages you normally don't have to do anything different from usual.

The Show_Normal routines will complain if they're called and the attribute is not actually set in the segment. Use Show_Existence() to avoid this, if necessary.

void Show_Net_Normal ( float *  x,
float *  y,
float *  z 
)

Similar to Show_Normal(), but returns the net effective normal rather than the local one.

Parameters:
x X-coordinate of the current normal of a face, edge, or vertex.
y Y-coordinate of the current normal of a face, edge, or vertex.
z Z-coordinate of the current normal of a face, edge, or vertex.

DETAILS

Use Show_Net_Normal() rather than Show_Normal to retrieve the internal HOOPS normal calculation.

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