code: package org.sunflow.core.accel;
  
  import org.sunflow.core.AccelerationStructure;
  import org.sunflow.core.IntersectionState;
  import org.sunflow.core.PrimitiveList;
  import org.sunflow.core.Ray;
  
  public class NullAccelerator implements AccelerationStructure {
      private PrimitiveList primitives;
      private int n;
  
      public NullAccelerator() {
          primitives = null;
          n = 0;
      }
  
      public void build(PrimitiveList primitives) {
          this.primitives = primitives;
          n = primitives.getNumPrimitives();
      }
  
      public void intersect(Ray r, IntersectionState state) {
          for (int i = 0; i < n; i++)
              primitives.intersectPrimitive(r, i, state);
      }
  }