binaries/assimp-3.1.1/port/Assimp.NET/Assimp.NET_DEMO/Camera.cs

/*
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Open Asset Import Library (ASSIMP)
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using Microsoft.DirectX;

namespace Assimp.Viewer {
    public class Camera {
	    public Camera () {
		    vPos = new Vector3(0.0f,0.0f,-10.0f);
            vLookAt = new Vector3(0.0f, 0.0f, 1.0f);
		    vUp = new Vector3(0.0f,1.0f,0.0f);
		    vRight = new Vector3(0.0f,1.0f,0.0f);
		}

	    // position of the camera
	    public Vector3 vPos;

	    // up-vector of the camera
        public Vector3 vUp;

	    // camera's looking point is vPos + vLookAt
        public Vector3 vLookAt;

	    // right vector of the camera
        public Vector3 vRight;


	    // Equation
	    // (vRight ^ vUp) - vLookAt == 0  
	    // needn't apply

        public Matrix GetMatrix() {
            vLookAt.Normalize();
            vRight = Vector3.Cross(vUp, vLookAt);
            vRight.Normalize();
            vUp = Vector3.Cross(vLookAt, vRight);
            vUp.Normalize();

            var view = Matrix.Identity;
            view.M11 = vRight.X;
            view.M12 = vUp.X;
            view.M13 = vLookAt.X;
            view.M14 = 0.0f;

            view.M21 = vRight.Y;
            view.M22 = vUp.Y;
            view.M23 = vLookAt.Y;
            view.M24 = 0.0f;

            view.M31 = vRight.Z;
            view.M32 = vUp.Z;
            view.M33 = vLookAt.Z;
            view.M34 = 0.0f;

            view.M41 = -Vector3.Dot(vPos, vRight);
            view.M42 = -Vector3.Dot(vPos, vUp);
            view.M43 = -Vector3.Dot(vPos, vLookAt);
            view.M44 = 1.0f;

            return view;
        }
    }
}