<Introduction to 3D Game Programming with Direct3D 11.0>\u7b2c15\u7ae0Camera\u7c7b\u7684C#(SharpDX)\u5b9e\u73b0\u3002<\/p>\n
using System;\nusing SharpDX;\n\nnamespace SharpDX_Study_001\n{\n class Camera\n {\n public Camera()\n {\n mPosition = Vector3.Zero;\n mRight = Vector3.UnitX;\n mUp = Vector3.UnitY;\n mLook = Vector3.UnitZ;\n SetLens(0.2f * SharpDX.MathUtil.Pi, 1.0f, 1.0f, 1000.0f);\n }\n public Vector4 PositionXM\n {\n get\n {\n return new Vector4(mPosition, 0);\n }\n }\n public Vector3 Position\n {\n get\n {\n return mPosition;\n }\n set\n {\n mPosition = value;\n }\n }\n public Vector4 RightXM\n {\n get\n {\n return new Vector4(mRight, 0);\n }\n }\n public Vector4 UpXM\n {\n get\n {\n return new Vector4(mUp, 0);\n }\n }\n public Vector4 LookXM\n {\n get\n {\n return new Vector4(mLook, 0);\n }\n }\n public Vector3 Right\n {\n get\n {\n return mRight;\n }\n }\n public Vector3 Look\n {\n get\n {\n return mLook;\n }\n }\n public Vector3 Up\n {\n get\n {\n return mUp;\n }\n }\n public float NearZ\n {\n get\n {\n return mNearZ;\n }\n }\n public float FarZ\n {\n get\n {\n return mFarZ;\n }\n }\n public float Aspect\n {\n get\n {\n return mAspect;\n }\n }\n public float FovY\n {\n get\n {\n return mFovY;\n }\n }\n public float FovX\n {\n get\n {\n float halfWidth = 0.5f * NearWindowWidth;\n return 2.0f * Convert.ToSingle(Math.Atan(halfWidth \/ mNearZ));\n }\n }\n public float NearWindowWidth\n {\n get\n {\n return mAspect * mNearWindowHeight;\n }\n }\n public float NearWindowHeight\n {\n get\n {\n return mNearWindowHeight;\n }\n }\n public float FarWindowWidth\n {\n get\n {\n return mAspect * mFarWindowHeight;\n }\n }\n public float FarWindowHeight\n {\n get\n {\n return mFarWindowHeight;\n }\n }\n\n \/\/\/ <summary>\n \/\/\/ Set frustum.\n \/\/\/ <\/summary>\n \/\/\/ <param name=\"fovY\"><\/param>\n \/\/\/ <param name=\"aspect\"><\/param>\n \/\/\/ <param name=\"zn\"><\/param>\n \/\/\/ <param name=\"zf\"><\/param>\n public void SetLens(float fovY, float aspect, float zn, float zf)\n {\n \/\/ cache properties\n mFovY = fovY;\n mAspect = aspect;\n mNearZ = zn;\n mFarZ = zf;\n\n mNearWindowHeight = 2.0f * mNearZ * Convert.ToSingle(Math.Tan(0.5f * mFovY));\n mFarWindowHeight = 2.0f * mFarZ * Convert.ToSingle(Math.Tan(0.5f * mFovY));\n\n mProj = Matrix.PerspectiveFovLH(mFovY, mAspect, mNearZ, mFarZ);\n }\n\n \/\/ \/\/ Define camera space via LookAt parameters.\n public void LookAt(Vector4 pos, Vector4 target, Vector4 worldUp)\n {\n Vector3 L = new Vector3(pos.X, pos.Y, pos.Z);\n Vector3 T = new Vector3(target.X, target.Y, target.Z);\n Vector3 U = new Vector3(worldUp.X, worldUp.Y, worldUp.Z);\n LookAt(L, T, U);\n }\n public void LookAt(Vector3 pos, Vector3 target, Vector3 up)\n {\n mPosition = pos;\n mLook = Vector3.Normalize(target - pos);\n mRight = Vector3.Normalize(Vector3.Cross(up, mLook));\n mUp = Vector3.Cross(mLook, mRight);\n }\n public Matrix View\n {\n get\n {\n return mView;\n }\n }\n public Matrix Proj\n {\n get\n {\n return mProj;\n }\n }\n public Matrix ViewProj\n {\n get\n {\n return View * Proj;\n }\n }\n \/\/ Strafe\/Walk the camera a distance d.\n public void Strafe(float d)\n {\n \/\/ mPosition += d*mRight\n Vector4 s = new Vector4(d);\n\n var nPos = (s * RightXM + PositionXM);\n mPosition = new Vector3(nPos.X, nPos.Y, nPos.Z);\n }\n public void Walk(float d)\n {\n \/\/ mPosition += d*mLook\n Vector4 s = new Vector4(d);\n var nPos = (s * LookXM + PositionXM);\n mPosition = new Vector3(nPos.X, nPos.Y, nPos.Z);\n }\n\n \/\/ Rotate the camera.\n public void Pitch(float angle)\n {\n \/\/ Rotate up and look vector about the right vector.\n\n Matrix R = Matrix.RotationAxis(mRight, angle);\n mUp = Vector3.TransformNormal(mUp, R);\n mLook = Vector3.TransformNormal(mLook, R);\n }\n public void RotateY(float angle)\n {\n \/\/ Rotate the basis vectors about the world y-axis.\n\n Matrix R = Matrix.RotationY(angle);\n mRight = Vector3.TransformNormal(mRight, R);\n mUp = Vector3.TransformNormal(mUp, R);\n mLook = Vector3.TransformNormal(mLook, R);\n }\n\n \/\/ After modifying camera position\/orientation, call to rebuild the view matrix.\n public void UpdateViewMatrix()\n {\n var R = mRight;\n var U = mUp;\n var L = mLook;\n var P = mPosition;\n\n \/\/ Keep camera's axes orthogonal to each other and of unit length.\n L = Vector3.Normalize(L);\n U = Vector3.Normalize(Vector3.Cross(mLook, mRight));\n\n \/\/ U, L already ortho-normal, so no need to normalize cross product.\n R = Vector3.Cross(U, L);\n\n \/\/ Fill in the view matrix entries.\n float x = -Vector3.Dot(P, R);\n float y = -Vector3.Dot(P, U);\n float z = -Vector3.Dot(P, L);\n\n mRight = R;\n mUp = U;\n mLook = L;\n\n mView.Column1 = new Vector4(mRight, x);\n mView.Column2 = new Vector4(mUp, y);\n mView.Column3 = new Vector4(mLook, z);\n mView.Column4 = Vector4.UnitW;\n }\n\n\n private Vector3 mPosition;\n\n private Vector3 mRight;\n\n private Vector3 mUp;\n\n private Vector3 mLook;\n\n\n \/\/ Cache frustum properties.\n float mNearZ;\n float mFarZ;\n float mAspect;\n float mFovY;\n float mNearWindowHeight;\n float mFarWindowHeight;\n\n Matrix mView;\n Matrix mProj;\n\n }\n}\n<\/pre>\n <\/p>\n","protected":false},"excerpt":{"rendered":"