CALL PSSAC(ACRI, LDR, DATREC)
INPUT PARAMETERS
A SET SURFACE APPROXIMATION CRITERIA element is inserted in the open structure after element pointer or replaces the element indicated by element pointer, depending on edit mode. Element pointer then points to the SET SURFACE APPROXIMATION CRITERIA element. The value specified by the parameter is associated with the element.
When an element of this type is interpreted, the current surface approximation criteria entry in the traversal state list is set to the values associated with the element. These values are used when displaying subsequent output primitives when the current surface approximation criteria ASF in the traversal state list is INDIVIDUAL.
Surface approximation criteria types are as follows:
PWDSA workstation dependent
PCBNSA constant parametric subdivision between knots
PCSWSA chordal size in WC
PCSNSA chordal size in NPC
PCSDSA chordal size in DC
PPDWSA planar deviation in WC
PPDNSA planar deviation in NPC
PPDDSA planar deviation in DC
PRWSA relative in WC
PRNSA relative in NPC
PRDSA relative in DC
When an element of this type is interpreted, if the specified approximation type is not available on a workstation, type PWDSA is used.
DATREC parameters to build SURFACE APPROXIMATION CRITERIA DATA
RECORD for ACRI =2(PCBNSA) :
The IA array contains :
- The actual data of u count
- The actual data of v count
The other arrays are empty.
IL = 2
IA(1) = u count
IA(2) = v count
RL = 0
RA = ()
SL = 0
LSTR = ()
STR = ()
DATREC parameters to build SURFACE APPROXIMATION CRITERIA DATA
RECORD for ACRI = 3(PCSWSA) or 4(PCSNSA) or 5(PCSDSA) :
The RA array contains :
- The actual data of u approximation value
- The actual data of v approximation value
The other arrays are empty.
IL = 0
IA = ()
RL = 2
RA(1) = u approximation value
RA(2) = v approximation value
SL = 0
LSTR = ()
STR =()
DATREC parameters to build SURFACE APPROXIMATION CRITERIA DATA
RECORD for ACRI =6(PPDWSA) or 7(PPDNSA) or 8(PPDDSA) or 9(PRWSA) or 10(PRNSA) or 11 (PRDSA) :
The RA array contains :
- The actual data of approximation value
The other arrays are empty.
IL = 0
IA = ()
RL = 1
RA(1) = approximation value
SL = 0
LSTR =()
STR = ()
If GPHIGS is in NRS mode, the effect of this function is different from the effect described in the standard.
In NRS mode, (see OPEN PIPE), the element is not stored in a structure. It is sent to the workstation on which the pipe is opened.
non-uniform b-spline curve 3, non-uniform b-spline curve 3 with colour, open structure, open pipe (ext), inquire current element content, inquire current element type and size