+
+ /* ---- traffic -------- */
+
+ for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
+ ent_traffic *traffic = mdl_arritm( &world->ent_traffic, i );
+
+ u32 i1 = traffic->index,
+ i0,
+ i2 = i1+1;
+
+ if( i1 == 0 ) i0 = traffic->node_count-1;
+ else i0 = i1-1;
+
+ if( i2 >= traffic->node_count ) i2 = 0;
+
+ i0 += traffic->start_node;
+ i1 += traffic->start_node;
+ i2 += traffic->start_node;
+
+ v3f h[3];
+
+ ent_route_node *rn0 = mdl_arritm( &world->ent_route_node, i0 ),
+ *rn1 = mdl_arritm( &world->ent_route_node, i1 ),
+ *rn2 = mdl_arritm( &world->ent_route_node, i2 );
+
+ v3_copy( rn1->co, h[1] );
+ v3_lerp( rn0->co, rn1->co, 0.5f, h[0] );
+ v3_lerp( rn1->co, rn2->co, 0.5f, h[2] );
+
+ float const k_sample_dist = 0.0025f;
+ v3f pc, pd;
+ eval_bezier3( h[0], h[1], h[2], traffic->t, pc );
+ eval_bezier3( h[0], h[1], h[2], traffic->t+k_sample_dist, pd );
+
+ v3f v0;
+ v3_sub( pd, pc, v0 );
+ float length = vg_maxf( 0.0001f, v3_length( v0 ) );
+ v3_muls( v0, 1.0f/length, v0 );
+
+ float mod = k_sample_dist / length;
+
+ traffic->t += traffic->speed * vg.time_delta * mod;
+
+ if( traffic->t > 1.0f ){
+ traffic->t -= 1.0f;
+
+ if( traffic->t > 1.0f ) traffic->t = 0.0f;
+
+ traffic->index ++;
+
+ if( traffic->index >= traffic->node_count )
+ traffic->index = 0;
+ }
+
+ v3_copy( pc, traffic->transform.co );
+
+ float a = atan2f( -v0[0], v0[2] );
+ q_axis_angle( traffic->transform.q, (v3f){0.0f,1.0f,0.0f}, -a );
+
+ vg_line_pt3( traffic->transform.co, 0.3f, VG__BLUE );
+ }