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https://github.com/w23/xash3d-fwgs
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270 lines
6.1 KiB
C
270 lines
6.1 KiB
C
/*
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pm_surface.c - surface tracing
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Copyright (C) 2010 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "common.h"
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#include "mathlib.h"
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#include "pm_local.h"
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typedef struct
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{
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float fraction;
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int contents;
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} linetrace_t;
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/*
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==================
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PM_RecursiveSurfCheck
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==================
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*/
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msurface_t *PM_RecursiveSurfCheck( model_t *model, mnode_t *node, vec3_t p1, vec3_t p2 )
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{
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float t1, t2, frac;
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int side, ds, dt;
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mplane_t *plane;
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msurface_t *surf;
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vec3_t mid;
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int i;
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if( node->contents < 0 )
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return NULL;
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plane = node->plane;
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if( plane->type < 3 )
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{
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t1 = p1[plane->type] - plane->dist;
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t2 = p2[plane->type] - plane->dist;
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}
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else
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{
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t1 = DotProduct( plane->normal, p1 ) - plane->dist;
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t2 = DotProduct( plane->normal, p2 ) - plane->dist;
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}
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if( t1 >= 0.0f && t2 >= 0.0f )
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return PM_RecursiveSurfCheck( model, node->children[0], p1, p2 );
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if( t1 < 0.0f && t2 < 0.0f )
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return PM_RecursiveSurfCheck( model, node->children[1], p1, p2 );
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frac = t1 / ( t1 - t2 );
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if( frac < 0.0f ) frac = 0.0f;
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if( frac > 1.0f ) frac = 1.0f;
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VectorLerp( p1, frac, p2, mid );
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side = (t1 < 0.0f);
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// now this is weird.
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surf = PM_RecursiveSurfCheck( model, node->children[side], p1, mid );
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if( surf != NULL || ( t1 >= 0.0f && t2 >= 0.0f ) || ( t1 < 0.0f && t2 < 0.0f ))
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{
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return surf;
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}
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surf = model->surfaces + node->firstsurface;
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for( i = 0; i < node->numsurfaces; i++, surf++ )
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{
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ds = (int)((float)DotProduct( mid, surf->texinfo->vecs[0] ) + surf->texinfo->vecs[0][3] );
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dt = (int)((float)DotProduct( mid, surf->texinfo->vecs[1] ) + surf->texinfo->vecs[1][3] );
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if( ds >= surf->texturemins[0] && dt >= surf->texturemins[1] )
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{
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int s = ds - surf->texturemins[0];
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int t = dt - surf->texturemins[1];
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if( s <= surf->extents[0] && t <= surf->extents[1] )
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return surf;
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}
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}
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return PM_RecursiveSurfCheck( model, node->children[side^1], mid, p2 );
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}
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/*
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==================
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PM_TraceTexture
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find the face where the traceline hit
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assume physentity is valid
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==================
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*/
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msurface_t *PM_TraceSurface( physent_t *pe, vec3_t start, vec3_t end )
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{
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matrix4x4 matrix;
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model_t *bmodel;
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hull_t *hull;
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vec3_t start_l, end_l;
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vec3_t offset;
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bmodel = pe->model;
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if( !bmodel || bmodel->type != mod_brush )
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return NULL;
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hull = &pe->model->hulls[0];
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VectorSubtract( hull->clip_mins, vec3_origin, offset );
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VectorAdd( offset, pe->origin, offset );
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VectorSubtract( start, offset, start_l );
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VectorSubtract( end, offset, end_l );
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// rotate start and end into the models frame of reference
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if( !VectorIsNull( pe->angles ))
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{
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Matrix4x4_CreateFromEntity( matrix, pe->angles, offset, 1.0f );
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Matrix4x4_VectorITransform( matrix, start, start_l );
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Matrix4x4_VectorITransform( matrix, end, end_l );
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}
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return PM_RecursiveSurfCheck( bmodel, &bmodel->nodes[hull->firstclipnode], start_l, end_l );
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}
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/*
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==================
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PM_TraceTexture
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find the face where the traceline hit
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assume physentity is valid
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==================
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*/
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const char *PM_TraceTexture( physent_t *pe, vec3_t start, vec3_t end )
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{
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msurface_t *surf = PM_TraceSurface( pe, start, end );
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if( !surf || !surf->texinfo || !surf->texinfo->texture )
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return NULL;
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return surf->texinfo->texture->name;
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}
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/*
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==================
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PM_TestLine_r
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optimized trace for light gathering
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==================
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*/
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int PM_TestLine_r( mnode_t *node, vec_t p1f, vec_t p2f, const vec3_t start, const vec3_t stop, linetrace_t *trace )
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{
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float front, back;
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float frac, midf;
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int r, side;
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vec3_t mid;
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loc0:
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if( node->contents < 0 )
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trace->contents = node->contents;
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if( node->contents == CONTENTS_SOLID )
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return CONTENTS_SOLID;
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if( node->contents == CONTENTS_SKY )
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return CONTENTS_SKY;
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if( node->contents < 0 )
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return CONTENTS_EMPTY;
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front = PlaneDiff( start, node->plane );
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back = PlaneDiff( stop, node->plane );
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if( front >= -ON_EPSILON && back >= -ON_EPSILON )
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{
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node = node->children[0];
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goto loc0;
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}
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if( front < ON_EPSILON && back < ON_EPSILON )
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{
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node = node->children[1];
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goto loc0;
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}
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side = (front < 0);
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frac = front / (front - back);
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frac = bound( 0.0, frac, 1.0 );
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VectorLerp( start, frac, stop, mid );
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midf = p1f + ( p2f - p1f ) * frac;
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r = PM_TestLine_r( node->children[side], p1f, midf, start, mid, trace );
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if( r != CONTENTS_EMPTY )
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{
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trace->fraction = midf;
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return r;
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}
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return PM_TestLine_r( node->children[!side], midf, p2f, mid, stop, trace );
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}
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int PM_TestLineExt( playermove_t *pmove, physent_t *ents, int numents, const vec3_t start, const vec3_t end, int flags )
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{
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linetrace_t trace, trace_bbox;
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matrix4x4 matrix;
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hull_t *hull = NULL;
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vec3_t offset, start_l, end_l;
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qboolean rotated;
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physent_t *pe;
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int i;
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trace.contents = CONTENTS_EMPTY;
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trace.fraction = 1.0f;
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for( i = 0; i < numents; i++ )
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{
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pe = &ents[i];
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if( i != 0 && ( flags & PM_WORLD_ONLY ))
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break;
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if( !pe->model || pe->model->type != mod_brush || pe->solid != SOLID_BSP )
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continue;
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if( pe->rendermode != kRenderNormal )
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continue;
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hull = &pe->model->hulls[0];
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hull = PM_HullForBsp( pe, pmove, offset );
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if( pe->solid == SOLID_BSP && !VectorIsNull( pe->angles ))
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rotated = true;
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else rotated = false;
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if( rotated )
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{
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Matrix4x4_CreateFromEntity( matrix, pe->angles, offset, 1.0f );
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Matrix4x4_VectorITransform( matrix, start, start_l );
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Matrix4x4_VectorITransform( matrix, end, end_l );
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}
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else
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{
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VectorSubtract( start, pe->origin, start_l );
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VectorSubtract( end, pe->origin, end_l );
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}
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trace_bbox.contents = CONTENTS_EMPTY;
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trace_bbox.fraction = 1.0f;
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PM_TestLine_r( &pe->model->nodes[hull->firstclipnode], 0.0f, 1.0f, start_l, end_l, &trace_bbox );
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if( trace_bbox.contents != CONTENTS_EMPTY || trace_bbox.fraction < trace.fraction )
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{
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trace = trace_bbox;
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}
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}
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return trace.contents;
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} |