UE4 3D坐标转2D坐标

UE4 3D坐标转2D坐标

视角相机

ulocalplayer->playercontroller->cameramanager->POV

struct FMatrix RotatorToMatrix(struct FRotator rotation) {float radPitch = rotation.Pitch * ((float)M_PI / 180.0f);float radYaw = rotation.Yaw * ((float)M_PI / 180.0f);float radRoll = rotation.Roll * ((float)M_PI / 180.0f);float SP = sinf(radPitch);float CP = cosf(radPitch);float SY = sinf(radYaw);float CY = cosf(radYaw);float SR = sinf(radRoll);float CR = cosf(radRoll);struct FMatrix matrix;matrix.M[0][0] = (CP * CY);matrix.M[0][1] = (CP * SY);matrix.M[0][2] = (SP);matrix.M[0][3] = 0;matrix.M[1][0] = (SR * SP * CY - CR * SY);matrix.M[1][1] = (SR * SP * SY + CR * CY);matrix.M[1][2] = (-SR * CP);matrix.M[1][3] = 0;matrix.M[2][0] = (-(CR * SP * CY + SR * SY));matrix.M[2][1] = (CY * SR - CR * SP * SY);matrix.M[2][2] = (CR * CP);matrix.M[2][3] = 0;matrix.M[3][0] = 0;matrix.M[3][1] = 0;matrix.M[3][2] = 0;matrix.M[3][3] = 1;return matrix;
}struct Vector2 WorldToScreen(struct Vector3 worldLocation, struct MinimalViewInfo camViewInfo)
{struct FMatrix tempMatrix = RotatorToMatrix(camViewInfo.Rotation);struct Vector3 vAxisX;struct Vector3 vAxisY;struct Vector3 vAxisZ;struct Vector3 vDelta;struct Vector3 vTransformed;struct Vector2 result;vAxisX.X=tempMatrix.M[0][0];vAxisX.Y=tempMatrix.M[0][1];vAxisX.Z=tempMatrix.M[0][2];vAxisY.X=tempMatrix.M[1][0];vAxisY.Y=tempMatrix.M[1][1];vAxisY.Z=tempMatrix.M[1][2];vAxisZ.X=tempMatrix.M[2][0];vAxisZ.Y=tempMatrix.M[2][1];vAxisZ.Z=tempMatrix.M[2][2];vDelta.X=worldLocation.X-camViewInfo.Location.X;vDelta.Y=worldLocation.Y-camViewInfo.Location.Y;vDelta.Z=worldLocation.Z-camViewInfo.Location.Z;vTransformed.X=Dot(vDelta, vAxisY);vTransformed.Y=Dot(vDelta, vAxisZ);vTransformed.Z=Dot(vDelta,vAxisX);if (vTransformed.Z < 1.0f) {vTransformed.Z = 1.0f;}float fov = camViewInfo.FOV;//printf("%0.2f",fov);float screenCenterX = width/2;//(width / 2.0f);float screenCenterY = height/2;//(height / 2.0f);result.X=(screenCenterX + vTransformed.X * (screenCenterX / tanf(fov * ((float)M_PI / 360.0f))) / vTransformed.Z);result.Y=(screenCenterY - vTransformed.Y * (screenCenterX / tanf(fov * ((float)M_PI / 360.0f))) / vTransformed.Z);if (result.X > 0 && result.Y > 0 && result.X <= width && result.Y <= height)printf("Screen Location is %0.2f %0.2f \n ",result.X,result.Y);return result;
}

投影矩阵

ulocalplayer->FsceneViewState->viewprojectionmartiex

矩阵特征

0.86 -0.1 0.0  -0.49
-0.5 -0.17 0 -0.85
-2.6 1.6 0 -0.12
-1131.72 -5003.95 10.0 -285.13

struct Vector3 World2Screen(struct FMatrix viewMatrix, struct Vector3 pos) {struct Vector3 screen;float screenW = (viewMatrix.M[0][3] * pos.X) + (viewMatrix.M[1][3] * pos.Y) + (viewMatrix.M[2][3] * pos.Z) + viewMatrix.M[3][3];if (screenW < 0.01f) //w 1.0screen.Z = 1;elsescreen.Z = 0;float screenX = (viewMatrix.M[0][0] * pos.X) + (viewMatrix.M[1][0] * pos.Y) + (viewMatrix.M[2][0] * pos.Z) + viewMatrix.M[3][0];float screenY = (viewMatrix.M[0][1] * pos.X) + (viewMatrix.M[1][1] * pos.Y) + (viewMatrix.M[2][1]* pos.Z) +viewMatrix.M[3][1];screen.Y = height/2 - height/2 * screenY / screenW;screen.X = width/2 + width/2 * screenX / screenW;//printf("\ninit screenX  %0.2f screenY %0.2f screenW %0.2f",screenX,screenY,screenW);if (screen.X > 0 && screen.Y > 0 && screen.X <= width && screen.Y <= height&&screen.Z==0)printf("view matriex   Screen Location is %0.2f %0.2f\n ",screen.X,screen.Y);return screen;
}

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