topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

game-xna-intro-XnaGraphicEngineChapter7-Helpers-Vector3Helper.cs / cs


  // Project: XnaGraphicEngine, File: Vector3Helper.cs
  // Namespace: XnaGraphicEngine.Helpers, Class: Vector3Helper
  // Path: C:\code\XnaGraphicEngine\Helpers, Author: Abi
  // Code lines: 62, Size of file: 2,14 KB
  // Creation date: 13.10.2006 23:14
  // Last modified: 20.10.2006 08:29
  // Generated with Commenter by abi.exDream.com
  
  #region Using directives
  using Microsoft.Xna.Framework;
  using System;
  using System.Collections.Generic;
  using System.Text;
  #endregion
  
  namespace XnaGraphicEngine.Helpers
  {

<summary> Vector 3 helper </summary> class Vector3Helper { #region Get angle between vectors <summary> Return angle between two vectors. Used for visbility testing and for checking angles between vectors for the road sign generation. </summary> <param name="vec1">Vector 1</param> <param name="vec2">Vector 2</param> <returns>Float</returns> public static float GetAngleBetweenVectors(Vector3 vec1, Vector3 vec2) { // See http://en.wikipedia.org/wiki/Vector_(spatial) // for help and check out the Dot Product section ^^ // Both vectors are normalized so we can save deviding through the // lengths. return (float)Math.Acos(Vector3.Dot(vec1, vec2)); } // GetAngleBetweenVectors(vec1, vec2) #endregion


                  #region Distance to line

<summary> Distance from our point to the line described by linePos1 and linePos2. </summary> <param name="point">Point</param> <param name="linePos1">Line position 1</param> <param name="linePos2">Line position 2</param> <returns>Float</returns> public static float DistanceToLine(Vector3 point, Vector3 linePos1, Vector3 linePos2) { // For help check out this article: // http://mathworld.wolfram.com/Point-LineDistance3-Dimensional.html Vector3 lineVec = linePos2-linePos1; Vector3 pointVec = linePos1-point; return Vector3.Cross(lineVec, pointVec).Length() / lineVec.Length(); } // DistanceToLine(point, linePos1, linePos2) #endregion


                  #region Signed distance to plane

<summary> Signed distance to plane </summary> <param name="point">Point</param> <param name="planePosition">Plane position</param> <param name="planeNormal">Plane normal</param> <returns>Float</returns> public static float SignedDistanceToPlane(Vector3 point, Vector3 planePosition, Vector3 planeNormal) { Vector3 pointVec = planePosition - point; return Vector3.Dot(planeNormal, pointVec); } // SignedDistanceToPlane(point, planePosition, planeNormal) #endregion } // class Vector3Helper } // namespace XnaGraphicEngine.Helpers

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