相机旋转

Question

与my previous question一样，我设法在opengl和jogl中创建了一个小太阳系:) 现在我想旋转相机以从不同角度展示它。
我设法旋转立方体，但它们的运动平面保持不变。

GL3 gl = drawable.getGL（）。getGL3（）;

gl.glClear(GL3.GL_COLOR_BUFFER_BIT | GL3.GL_DEPTH_BUFFER_BIT); 
    //Model View Matrix 

    //Mat4 mv = new Mat4(); 
    Mat4 mv = MatrixMath.lookAt(this.eyeX,this.eyeY,this.eyeZ,this.at,this.up); 
    mv = mv.mul(MatrixMath.rotationZ(satellite)); 
    mv.set(2, 2, 0.0f); 
    mv.set(2, 3, 0.0f); 

    cubeprogram.passUniformMatrix(gl, "model_view", mv); 

    gl.glDrawArrays(GL3.GL_TRIANGLES, 0, numVertices); 

    angle += 2.0f; 
    satellite = angle + 8.0f; 
    if (angle > 360.0f) 
    angle -= 360.0f; 

    float positionX = setMovementX(angle, 0.8f); 
    float positionZ = setMovementZ(angle, 0.8f); 
    // mv = MatrixMath.lookAt(this.eyeX,this.eyeY,this.eyeZ,this.at,this.up); 
    mv = mv.mul(MatrixMath.rotationZ(satellite)); 
    mv.set(0, 3, positionX); 
    mv.set(2, 3, positionZ); 
    cubeprogram.passUniformMatrix(gl, "model_view", mv); 
    gl.glDrawArrays(GL3.GL_TRIANGLES, 0, numVertices); 
    positionX = setMovementX(satellite, 0.2f); 
    positionZ = setMovementZ(satellite, 0.2f); 
    Mat4 sm = new Mat4(1.0f, 0.0f, 0.0f, positionX, 
      0.0f, 1.0f, 0.0f, 0.0f, 
      0.0f, 0.0f, 1.0f, positionZ, 
      0.0f, 0.0f, 0.0f, 1.0f); 
    mv = mv.mul(sm); 
    mv = mv.mul(MatrixMath.rotationZ(angle)); 
    cubeprogram.use(gl); 
    cubeprogram.passUniformMatrix(gl, "model_view", mv); 
    gl.glDrawArrays(GL3.GL_TRIANGLES, 0, numVertices); 
    cubeprogram.setUniformMatrix("projection", projection);` 

//定义

public static Mat4 lookAt(Vec4 eye, Vec4 at, Vec4 up) { 
    final Vec4 eyeneg = eye.neg(); 

    final Vec4 n = VectorMath.normalize(eye.sub(at)); 
    final Vec4 u = VectorMath.normalize(VectorMath.cross(up, n)); 
    final Vec4 v = VectorMath.normalize(VectorMath.cross(n, u)); 
    final Vec4 t = new Vec4(0, 0, 0, 1); 
    final Mat4 c = new Mat4(u, v, n, t); 

    return c.mul(MatrixMath.translate(eyeneg)); 
} 
public static Mat4 lookAt(float x, float y, float z, Vec4 at, Vec4 up) { 
    final Vec4 eye = new Vec4(x, y, z, 1.0f); 
    return lookAt(eye, at, up); 
} 

Answer 1

检查JOGL的pmvMatrix

相机：

pmvMatrix.glMatrixMode(GLMatrixFunc.GL_PROJECTION); 
pmvMatrix.glLoadIdentity(); 
pmvMatrix.gluPerspective(fov, aspect, zNear, zFar); 
pmvMatrix.glMatrixMode(GLMatrixFunc.GL_MODELVIEW); 
pmvMatrix.glLoadIdentity(); 
pmvMatrix.glRotatef(-pitch, 1, 0, 0); 
pmvMatrix.glRotatef(-yaw, 0, 1, 0); 
pmvMatrix.glRotatef(-roll, 0, 0, 1); 
pmvMatrix.glTranslatef(-position.x, -position.y, -position.z); 
pmvMatrix.update(); 

修正功能：

gl.glMatrixMode(GLMatrixFunc.GL_PROJECTION); 
gl.glLoadMatrixf(pmvMatrix.glGetPMatrixf()); 
gl.glMatrixMode(GLMatrixFunc.GL_MODELVIEW); 
gl.glLoadMatrixf(pmvMatrix.glGetMvMatrixf()); 

个

着色器：

GLUniformData pmvMatrixUniform; 

初始化代码...

PMVMatrix pmvMatrix = ...; 
state.attachObject("pmvMatrix", pmvMatrix); 
pmvMatrixUniform = new GLUniformData("pmvMatrix", 4, 4, pmvMatrix.glGetPMvMatrixf()); 
state.ownUniform(pmvMatrixUniform); 
state.uniform(gl, pmvMatrixUniform); 

显示的代码......

state.uniform(gl, pmvMatrixUniform);