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我正在尝试为我的 DirectX 游戏创建一个第一人称射击相机。但我正在努力让我的视图矩阵正确。目前我只能在屏幕上显示一个三角形，但是当我旋转相机并向前移动时，三角形似乎是在围绕相机旋转。这是我为相机类所做的代码

相机.h

#pragma once

#include"Window.h"
#include"Matrix.h"
#include "Vector3.h"

class Camera
{
public:
    Camera();
    Camera(float pitch, float yaw, Vector3 position);
    ~Camera();

    void Update();

    D3DXMATRIX BuildViewMatrix();

    Vector3 GetPosition() const { return position; }
    void SetPosition(Vector3 val) { position = val; }

protected:
    float yaw;
    float pitch;
    Vector3 position;
};

相机.cpp

#include"Camera.h"
Camera::Camera()
{
    yaw = 0.0f;
    pitch = 0.0f;
}

Camera::Camera(float pitch, float yaw, Vector3 position)
{
    this->pitch = pitch;
    this->yaw = yaw;
    this->position = position;
}

Camera::~Camera()
{
}

void Camera::Update()
{
    pitch = min(pitch, 90.0f);
    pitch = max(pitch, -90.0f);

    if(yaw < 0)
        yaw += 360.0f;

    if( yaw > 360.0f)
        yaw -= 360.0f;


    if(Window::GetKeyboard()->KeyDown(KEYBOARD_W))
    {
        D3DXMATRIX translateMat;
        D3DXMatrixTranslation(&translateMat, position.x, position.y, position.z);

        D3DXMATRIX rotationMat;
        D3DXMatrixRotationY(&rotationMat, D3DXToRadian(yaw));

        D3DXMATRIX forwardMat;
        D3DXMatrixTranslation(&forwardMat, 0.0f, 0.0f, 10.0f);

        D3DXMATRIX transformMat = translateMat * rotationMat * forwardMat;

        position.x = transformMat._41;
        position.y = transformMat._42;
        position.z = transformMat._43;

        std::cout << "X: " << transformMat._41 << std::endl;
        std::cout << "Y: " << transformMat._42 << std::endl;
        std::cout << "Z: " << transformMat._43 << std::endl;
    }
    else if(Window::GetKeyboard()->KeyDown(KEYBOARD_S))
    {
    D3DXMATRIX translateMat;
    D3DXMatrixTranslation(&translateMat, position.x, position.y, position.z);

    D3DXMATRIX rotationMat;
    D3DXMatrixRotationY(&rotationMat, D3DXToRadian(yaw));

    D3DXMATRIX forwardMat;
    D3DXMatrixTranslation(&forwardMat, 0.0f, 0.0f, -10.0f);

    D3DXMATRIX transformMat = translateMat * rotationMat * forwardMat;

    position.x = transformMat._41;
    position.y = transformMat._42;
    position.z = transformMat._43;

    std::cout << "X: " << transformMat._41 << std::endl;
    std::cout << "Y: " << transformMat._42 << std::endl;
    std::cout << "Z: " << transformMat._43 << std::endl;
    }


    if(Window::GetKeyboard()->KeyDown(KEYBOARD_Q))
    {
        yaw = yaw - 1.0f;
    }

    if(Window::GetKeyboard()->KeyDown(KEYBOARD_E))
    {
        yaw = yaw + 1.0f;
    }
}

D3DXMATRIX Camera::BuildViewMatrix()
{
    D3DXMATRIX translationMat;
    D3DXMatrixTranslation(&translationMat, (position.x * -1.0f), (position.y * -1.0f), (position.z * -1.0f));

    D3DXMATRIX yawMat;
    D3DXMatrixRotationY(&yawMat, D3DXToRadian((yaw * -1.0f)));

    D3DXMATRIX pitchMat;
    D3DXMatrixRotationX(&pitchMat, D3DXToRadian((pitch * -1.0f)));

    D3DXMATRIX viewMat = pitchMat * yawMat * translationMat;

    return viewMat;
}

我device->SetTransform(D3DTS_VIEW, &camera->BuildViewMatrix());用来将视图矩阵发送到directX。我到底做错了什么？请帮忙

更新：

我更改了代码并尝试使用该D3DXMatrixLookAtLH功能（根本不使用相机），但这一次，它什么也没做 - 无论我如何更改 LookAt 上的参数，三角形都保持在同一位置功能。这是它的代码：

void Renderer::Render()
{
    device->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(40, 40, 40), 1.0f, 0);

    device->BeginScene(); //Must be used as it tells DirectX we're starting to draw stuff.

    D3DXMATRIX worldMat;
    D3DXMatrixTranslation(&worldMat, 0.0f, 0.0f, 0.0f);
    device->SetTransform(D3DTS_WORLD, &worldMat);

    D3DXMATRIX viewMatrix;
    D3DXMatrixLookAtLH( &viewMatrix, 
                        &D3DXVECTOR3(0.0f, -100.0f, 1000.0f), //position
                        &D3DXVECTOR3(0.0f, 1.0f, 0.0f), //Look at
                        &D3DXVECTOR3(0.0f, 1.0f, 0.0f));
    device->SetTransform(D3DTS_VIEW, &viewMatrix);
    //device->SetTransform(D3DTS_VIEW, &camera->BuildViewMatrix());

    D3DXMATRIX projMatrix;
    D3DXMatrixPerspectiveFovLH( &projMatrix,
                                D3DXToRadian(45),
                                (float)width/(float)height,
                                1.0f,
                                10000.0f);
    device->SetTransform(D3DTS_PROJECTION, &projMatrix);

    device->SetFVF(VERTEXFORMAT);
    device->SetStreamSource(0, vertexBuffer, 0, sizeof(VERTEX));
    device->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);

    device->EndScene(); //Thank you for waiting, I have finished drawing stuff on the screen, please handle the rest Mr DirectX.

    device->Present(NULL, NULL, NULL, NULL);
}
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1 回答 1

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发现了问题，我计算的矩阵和视图矩阵都不正确。通过添加以下代码来修复它：

相机.h

#pragma once

#pragma comment(lib, "d3dx9.lib")
#include<d3dx9math.h>

#include"Window.h"

class Camera
{
public:
    Camera();
    Camera(float pitch, float yaw, D3DXVECTOR3 position);
    ~Camera();

    void Update();

    D3DXMATRIX BuildViewMatrix();

    inline D3DXVECTOR3 GetPosition() const { return position; }
    inline void SetPosition(D3DXVECTOR3 position){ this->position = position;}

protected:
    float yaw;
    float pitch;
    float roll;
    D3DXVECTOR3 position;

private:
    D3DXVECTOR3 xAxis;
    D3DXVECTOR3 yAxis;
    D3DXVECTOR3 zAxis;
};

相机.cpp

#include"Camera.h"
Camera::Camera()
{
    yaw = 0.0f;
    pitch = 0.0f;
    roll = 0.0f;
}

//yaw = head twist
//pitch = head tilt
Camera::Camera(float pitch, float yaw, D3DXVECTOR3 position)
{
    this->pitch = pitch;
    this->yaw = yaw;
    roll = 0.0f;
    this->position = position;

    xAxis = D3DXVECTOR3(1.0f, 0.0f, 0.0f);
    yAxis = D3DXVECTOR3(0.0f, 1.0f, 0.0f);
    zAxis = D3DXVECTOR3(0.0f, 0.0f, 1.0f);
}

Camera::~Camera()
{

}

void Camera::Update()
{

    if(Window::GetKeyboard()->KeyDown(KEYBOARD_Q)){
        yaw -= 1.0f;
    }
    else if(Window::GetKeyboard()->KeyDown(KEYBOARD_E)){
        yaw += 1.0f;
    }

    if(Window::GetKeyboard()->KeyDown(KEYBOARD_Z)){
        pitch += 1.0f;
    }
    else if(Window::GetKeyboard()->KeyDown(KEYBOARD_X)){
        pitch -= 1.0f;
    }

    pitch = min(pitch, 90.0f);
    pitch = max(pitch, -90.0f);

    if(yaw < 0.0f)
        yaw += 360.0f;

    if( yaw > 360.0f)
        yaw -= 360.0f;


    D3DXMATRIX yawMat;
    D3DXMatrixRotationAxis(&yawMat, &yAxis, D3DXToRadian(yaw));
    D3DXVec3TransformCoord(&zAxis, &zAxis, &yawMat);
    D3DXVec3TransformCoord(&xAxis, &xAxis, &yawMat);

    D3DXMATRIX pitchMat;
    D3DXMatrixRotationAxis(&pitchMat, &xAxis, D3DXToRadian(pitch));
    D3DXVec3TransformCoord(&zAxis, &zAxis, &pitchMat);
    D3DXVec3TransformCoord(&yAxis, &yAxis, &pitchMat);

    D3DXMATRIX rollMat;
    D3DXMatrixRotationAxis(&rollMat, &zAxis, D3DXToRadian(0.0f));
    D3DXVec3TransformCoord(&xAxis, &xAxis, &rollMat);
    D3DXVec3TransformCoord(&yAxis, &yAxis, &rollMat);

    if(Window::GetKeyboard()->KeyDown(KEYBOARD_W))
    {
        position = position + (zAxis * -1) * 10.0f;
    }
    else if(Window::GetKeyboard()->KeyDown(KEYBOARD_S))
    {
        position = position + zAxis * 10.0f;
    }

    if(Window::GetKeyboard()->KeyDown(KEYBOARD_A))
    {
        position = position + xAxis * 10.0f;
    }
    else if(Window::GetKeyboard()->KeyDown(KEYBOARD_D))
    {
        position = position - xAxis * 10.0f;
    }

    yaw = 0.0f;
    pitch = 0.0f;
    roll = 0.0f;
}

D3DXMATRIX Camera::BuildViewMatrix()
{
    D3DXMATRIX viewMatrix;
    D3DXMatrixIdentity(&viewMatrix);

    viewMatrix._11 = xAxis.x;
    viewMatrix._21 = xAxis.y;
    viewMatrix._31 = xAxis.z;

    viewMatrix._12 = yAxis.x;
    viewMatrix._22 = yAxis.y;
    viewMatrix._32 = yAxis.z;

    viewMatrix._13 = zAxis.x;
    viewMatrix._23 = zAxis.y;
    viewMatrix._33 = zAxis.z;

    viewMatrix._41 = D3DXVec3Dot(&position, &xAxis);
    viewMatrix._42 = D3DXVec3Dot(&position, &yAxis);
    viewMatrix._43 = D3DXVec3Dot(&position, &zAxis);

    return viewMatrix;
}
于 2013-05-28T13:13:52.137 回答