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我试图创建一个第一人称相机。我拿了我 XNA 项目的一段代码，并试图将它转换成 java (LWJGL)。

Matrix4f mx = Matrix4f.rotate(pitch, new Vector3f(1, 0, 0),
            new Matrix4f(), null);

   Matrix4f my = Matrix4f.rotate(yaw, new Vector3f(0, 1, 0),
            new Matrix4f(), null);

    Matrix4f rotationMatrix = Matrix4f.mul(mx, my, null);

    Vector4f tmp = Matrix4f.transform(rotationMatrix, new Vector4f(0, 0,
            -1, 0), null);

    target = new Vector3f(position.x + tmp.x, position.y + tmp.y,
            position.z + tmp.z);

    GLU.gluLookAt(this.position.x, this.position.y, this.position.z,
            this.target.x, this.target.y, this.target.z, 0, 1.0f, 0);

如果我移动鼠标，俯仰和偏航将增加/减少。在开始运行我的游戏时，它运行良好，但经过一些动作后，我无法向下或向上看。如果我的位置 < 0 会发生这种情况吗？

完美运行的 XNA 代码：

         Matrix rotationMatrix = Matrix.CreateRotationX(pitch) * Matrix.CreateRotationY(yaw);

        camera.Target = Vector3.Transform(Vector3.Forward, rotationMatrix) + camera.Position;
        this.viewMatrix = Matrix.CreateLookAt(this.position, this.target, Vector3.Up);

编辑

所以我发现 LWJGL 和 XNA 在旋转矩阵方面有些不同。

爪哇：

Matrix4f mx = Matrix4f.rotate(1.2345f, new Vector3f(1,0,0),new Matrix4f(),null);

结果：

{1.0 0.0 0.0 0.0} {0.0 0.3299931 -0.9439833 0.0}{0.0 0.9439833 0.3299931 0.0}{0.0 0.0 0.0 1.0}

XNA

Matrix.CreateRotationX(1.2345f)

结果：

{1,0,0,0} {0,0.3299931,0.9439833,0} {0,-0.9439833,0.3299931,0} {0,0,0,1}

区别是 -0.9439833 和 +0.9439833 ...有人可以解释一下为什么会有不同的结果吗？不是一样的功能吗？

谢谢！

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1 回答 1

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原来如此。好吧，这就是与众不同。最后我解决了我的问题。问题是 LWJGL 中的“转换”方法。那是我最后的工作代码。也许我可以优化它？

    public static Matrix4f createRotationX(float pitch) {
    Matrix4f mX = new Matrix4f();
    mX.m00 = 1;
    mX.m10 = 0;
    mX.m20 = 0;
    mX.m30 = 0;
    mX.m01 = 0;
    mX.m11 = (float) Math.cos(pitch);
    mX.m21 = (float) Math.sin(pitch);
    mX.m02 = 0;
    mX.m03 = 0;
    mX.m12 = (float) -Math.sin(pitch);
    mX.m22 = (float) Math.cos(pitch);
    mX.m23 = 0;
    mX.m03 = 0;
    mX.m13 = 0;
    mX.m23 = 0;
    mX.m33 = 1;
    return mX;
}

public static Matrix4f createRotationY(float yaw) {
    Matrix4f mY = new Matrix4f();
    mY.m00 = (float) Math.cos(yaw);
    mY.m10 = 0;
    mY.m20 = (float) -Math.sin(yaw);
    mY.m30 = 0;
    mY.m01 = 0;
    mY.m11 = 1;
    mY.m21 = 0;
    mY.m31 = 0;
    mY.m02 = (float) Math.sin(yaw);
    mY.m12 = 0;
    mY.m22 = (float) Math.cos(yaw);
    mY.m23 = 0;
    mY.m03 = 0;
    mY.m13 = 0;
    mY.m23 = 0;
    mY.m33 = 1;
    return mY;
}

public static Vector3f getNewTarget(Vector3f position,float pitch, float yaw){

    Matrix4f mx = MathUtil.createRotationX(pitch);
    Matrix4f my = MathUtil.createRotationY(yaw);      

    Matrix4f rotationMatrix = Matrix4f.mul(mx, my, null);

    Matrix4f def = new Matrix4f();
    def.m20 = -1;
    def.m00 = 0;
    def.m11 = 0;
    def.m22 = 0;
    def.m33 = 0;

    Matrix4f v4 = Matrix4f.mul(def,rotationMatrix,null);

    return new Vector3f(v4.m00+position.x, v4.m10+position.y, v4.m20+position.z);
}
于 2013-04-05T12:48:42.527 回答