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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* cone.c - routines for making cones |
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* |
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* 2/12/86 |
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*/ |
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#include "copyright.h" |
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#include "standard.h" |
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#include "object.h" |
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CONE * |
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getcone(o, getxf) /* get cone structure */ |
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register OBJREC *o; |
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int getxf; |
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getcone( /* get cone structure */ |
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OBJREC *o, |
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int getxf |
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) |
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{ |
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double fabs(), sqrt(); |
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register CONE *co; |
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int sgn0, sgn1; |
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CONE *co; |
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|
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if ((co = (CONE *)o->os) == NULL) { |
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co->ca = o->oargs.farg; |
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/* get radii */ |
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if (o->otype == OBJ_CYLINDER || o->otype == OBJ_TUBE) { |
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if ((o->otype == OBJ_CYLINDER) | (o->otype == OBJ_TUBE)) { |
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if (o->oargs.nfargs != 7) |
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goto argcerr; |
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if (co->ca[6] <= FTINY) |
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if (co->ca[6] < -FTINY) { |
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objerror(o, WARNING, "negative radius"); |
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o->otype = o->otype == OBJ_CYLINDER ? |
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OBJ_TUBE : OBJ_CYLINDER; |
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co->ca[6] = -co->ca[6]; |
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} else if (co->ca[6] <= FTINY) |
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goto raderr; |
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co->p0 = 0; co->p1 = 3; |
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co->r0 = co->r1 = 6; |
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} else { |
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if (o->oargs.nfargs != 8) |
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goto argcerr; |
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if (co->ca[6] < 0.0 || co->ca[7] < 0.0) |
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if (co->ca[6] < -FTINY) sgn0 = -1; |
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else if (co->ca[6] > FTINY) sgn0 = 1; |
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else sgn0 = 0; |
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if (co->ca[7] < -FTINY) sgn1 = -1; |
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else if (co->ca[7] > FTINY) sgn1 = 1; |
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else sgn1 = 0; |
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if (sgn0+sgn1 == 0) |
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goto raderr; |
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if (fabs(co->ca[7] - co->ca[6]) <= FTINY) |
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goto raderr; |
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co->r0 = 6; |
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co->r1 = 7; |
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if ((sgn0 < 0) | (sgn1 < 0)) { |
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if (o->otype == OBJ_RING) |
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goto raderr; |
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objerror(o, WARNING, "negative radii"); |
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o->otype = o->otype == OBJ_CONE ? |
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OBJ_CUP : OBJ_CONE; |
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} |
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co->ca[6] = co->ca[6]*sgn0; |
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co->ca[7] = co->ca[7]*sgn1; |
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if (co->ca[7] - co->ca[6] > FTINY) { |
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if (o->otype == OBJ_RING) |
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co->p0 = co->p1 = 0; |
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else { |
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co->p0 = 0; co->p1 = 3; |
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} |
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co->r0 = 6; co->r1 = 7; |
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} else if (co->ca[6] - co->ca[7] > FTINY) { |
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if (o->otype == OBJ_RING) |
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co->p0 = co->p1 = 0; |
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else { |
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co->p0 = 3; co->p1 = 0; |
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} |
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co->r0 = 7; co->r1 = 6; |
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} else { |
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if (o->otype == OBJ_RING) |
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goto raderr; |
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o->otype = o->otype == OBJ_CONE ? |
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OBJ_CYLINDER : OBJ_TUBE; |
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o->oargs.nfargs = 7; |
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co->p0 = 0; co->p1 = 3; |
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co->r0 = co->r1 = 6; |
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} |
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} |
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/* get axis orientation */ |
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co->p0 = 0; |
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if (o->otype == OBJ_RING) { |
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if (co->ca[6] > co->ca[7]) { /* make r0 smaller */ |
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co->r0 = 7; |
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co->r1 = 6; |
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} |
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co->p1 = 0; |
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if (o->otype == OBJ_RING) |
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VCOPY(co->ad, o->oargs.farg+3); |
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} else { |
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co->p1 = 3; |
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co->ad[0] = co->ca[3] - co->ca[0]; |
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co->ad[1] = co->ca[4] - co->ca[1]; |
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co->ad[2] = co->ca[5] - co->ca[2]; |
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else { |
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co->ad[0] = CO_P1(co)[0] - CO_P0(co)[0]; |
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co->ad[1] = CO_P1(co)[1] - CO_P0(co)[1]; |
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co->ad[2] = CO_P1(co)[2] - CO_P0(co)[2]; |
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} |
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co->al = normalize(co->ad); |
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if (co->al == 0.0) |
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objerror(o, USER, "zero orientation"); |
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if (co->al == 0.0) { |
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objerror(o, WARNING, "unknown orientation"); |
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free(co); |
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return(NULL); |
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} |
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/* compute axis and side lengths */ |
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if (o->otype == OBJ_RING) { |
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co->al = 0.0; |
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co->sl = co->ca[co->r1] - co->ca[co->r0]; |
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} else if (o->otype == OBJ_CONE || o->otype == OBJ_CUP) { |
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co->sl = CO_R1(co) - CO_R0(co); |
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} else if ((o->otype == OBJ_CONE) | (o->otype == OBJ_CUP)) { |
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co->sl = co->ca[7] - co->ca[6]; |
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co->sl = sqrt(co->sl*co->sl + co->al*co->al); |
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} else { /* OBJ_CYLINDER || OBJ_TUBE */ |
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} else { /* OBJ_CYLINDER or OBJ_TUBE */ |
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co->sl = co->al; |
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} |
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co->tm = NULL; |
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(CONE *)o->os = co; |
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o->os = (char *)co; |
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} |
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if (getxf && co->tm == NULL) |
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conexform(co); |
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argcerr: |
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objerror(o, USER, "bad # arguments"); |
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raderr: |
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objerror(o, USER, "illegal radii"); |
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objerror(o, WARNING, "illegal radii"); |
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free(co); |
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return(NULL); |
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} |
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freecone(o) /* free memory associated with cone */ |
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OBJREC *o; |
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void |
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freecone(OBJREC *o) /* free memory associated with cone */ |
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{ |
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register CONE *co = (CONE *)o->os; |
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CONE *co = (CONE *)o->os; |
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if (co == NULL) |
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return; |
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if (co->tm != NULL) |
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free((char *)co->tm); |
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free(o->os); |
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free((void *)co->tm); |
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free((void *)co); |
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o->os = NULL; |
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} |
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conexform(co) /* get cone transformation matrix */ |
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register CONE *co; |
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void |
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conexform(CONE *co) /* get cone transformation matrix */ |
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{ |
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double sqrt(), fabs(); |
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double m4[4][4]; |
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register double d; |
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register int i; |
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MAT4 m4; |
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double d; |
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int i; |
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co->tm = (double (*)[4])malloc(sizeof(m4)); |
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co->tm = (RREAL (*)[4])malloc(sizeof(MAT4)); |
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if (co->tm == NULL) |
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error(SYSTEM, "out of memory in conexform"); |
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if (co->r0 == co->r1) |
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d = 0.0; |
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else |
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d = co->ca[co->r0] / (co->ca[co->r1] - co->ca[co->r0]); |
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d = CO_R0(co) / (CO_R1(co) - CO_R0(co)); |
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for (i = 0; i < 3; i++) |
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co->tm[3][i] = d*(co->ca[co->p1+i] - co->ca[co->p0+i]) |
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- co->ca[co->p0+i]; |
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co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i]) |
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- CO_P0(co)[i]; |
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/* rotate to positive z-axis */ |
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setident4(m4); |
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multmat4(co->tm, co->tm, m4); |
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/* scale z-axis */ |
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setident4(m4); |
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if (co->p0 != co->p1 && co->r0 != co->r1) { |
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d = fabs(co->ca[co->r1] - co->ca[co->r0]); |
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m4[2][2] = d/co->al; |
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if ((co->p0 != co->p1) & (co->r0 != co->r1)) { |
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setident4(m4); |
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m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al; |
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multmat4(co->tm, co->tm, m4); |
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} |
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multmat4(co->tm, co->tm, m4); |
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} |