Khaotic Engine Reborn
Loading...
Searching...
No Matches
Public Member Functions | List of all members
frustum Class Reference

Public Member Functions

void ConstructFrustum (float screenDepth, XMMATRIX projectionMatrix, XMMATRIX viewMatrix)
 
bool CheckCube (float xCenter, float yCenter, float zCenter, float radius, float tolerance)
 

Detailed Description

Definition at line 4 of file frustum.h.

Member Function Documentation

◆ CheckCube()

bool frustum::CheckCube ( float xCenter,
float yCenter,
float zCenter,
float radius,
float tolerance )

Check if a point is inside the frustum.

Parameters
xX coordinate of the point.
yY coordinate of the point.
zZ coordinate of the point.
Returns
True if the point is inside the frustum, otherwise false.

Definition at line 59 of file frustum.cpp.

60{
61 // Vérifiez chaque plan du frustum pour voir si le cube est ŕ l'intérieur
62 for (int i = 0; i < 6; i++)
63 {
64 XMVECTOR plane = m_planes[i];
65 if (XMVectorGetX(plane) * (xCenter - radius) + XMVectorGetY(plane) * (yCenter - radius) + XMVectorGetZ(plane) * (zCenter - radius) + XMVectorGetW(plane) > -tolerance)
66 continue;
67 if (XMVectorGetX(plane) * (xCenter + radius) + XMVectorGetY(plane) * (yCenter - radius) + XMVectorGetZ(plane) * (zCenter - radius) + XMVectorGetW(plane) > -tolerance)
68 continue;
69 if (XMVectorGetX(plane) * (xCenter - radius) + XMVectorGetY(plane) * (yCenter + radius) + XMVectorGetZ(plane) * (zCenter - radius) + XMVectorGetW(plane) > -tolerance)
70 continue;
71 if (XMVectorGetX(plane) * (xCenter + radius) + XMVectorGetY(plane) * (yCenter + radius) + XMVectorGetZ(plane) * (zCenter - radius) + XMVectorGetW(plane) > -tolerance)
72 continue;
73 if (XMVectorGetX(plane) * (xCenter - radius) + XMVectorGetY(plane) * (yCenter - radius) + XMVectorGetZ(plane) * (zCenter + radius) + XMVectorGetW(plane) > -tolerance)
74 continue;
75 if (XMVectorGetX(plane) * (xCenter + radius) + XMVectorGetY(plane) * (yCenter - radius) + XMVectorGetZ(plane) * (zCenter + radius) + XMVectorGetW(plane) > -tolerance)
76 continue;
77 if (XMVectorGetX(plane) * (xCenter - radius) + XMVectorGetY(plane) * (yCenter + radius) + XMVectorGetZ(plane) * (zCenter + radius) + XMVectorGetW(plane) > -tolerance)
78 continue;
79 if (XMVectorGetX(plane) * (xCenter + radius) + XMVectorGetY(plane) * (yCenter + radius) + XMVectorGetZ(plane) * (zCenter + radius) + XMVectorGetW(plane) > -tolerance)
80 continue;
81
82 // Si le cube est en dehors de l'un des plans, il n'est pas dans le frustum
83 return false;
84 }
85
86 // Si le cube est ŕ l'intérieur de tous les plans, il est dans le frustum
87 return true;
88}

◆ ConstructFrustum()

void frustum::ConstructFrustum ( float screenDepth,
XMMATRIX projectionMatrix,
XMMATRIX viewMatrix )

Create a frustum object.

Parameters
screenDepth
projectionMatrix
viewMatrix

Definition at line 3 of file frustum.cpp.

4{
5 XMMATRIX matrix;
6 XMVECTOR planes[6];
7
8 // Calculate the minimum Z distance in the frustum.
9 float zMinimum = -projectionMatrix.r[3].m128_f32[2] / projectionMatrix.r[2].m128_f32[2];
10 float r = screenDepth / (screenDepth - zMinimum);
11 projectionMatrix.r[2].m128_f32[2] = r;
12 projectionMatrix.r[3].m128_f32[2] = -r * zMinimum;
13
14 // Create the frustum matrix from the view matrix and updated projection matrix.
15 matrix = XMMatrixMultiply(viewMatrix, projectionMatrix);
16
17 // Calculate near plane of frustum.
18 planes[0] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] + matrix.r[0].m128_f32[2],
19 matrix.r[1].m128_f32[3] + matrix.r[1].m128_f32[2],
20 matrix.r[2].m128_f32[3] + matrix.r[2].m128_f32[2],
21 matrix.r[3].m128_f32[3] + matrix.r[3].m128_f32[2]));
22
23 // Calculate far plane of frustum.
24 planes[1] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] - matrix.r[0].m128_f32[2],
25 matrix.r[1].m128_f32[3] - matrix.r[1].m128_f32[2],
26 matrix.r[2].m128_f32[3] - matrix.r[2].m128_f32[2],
27 matrix.r[3].m128_f32[3] - matrix.r[3].m128_f32[2]));
28
29 // Calculate left plane of frustum.
30 planes[2] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] + matrix.r[0].m128_f32[0],
31 matrix.r[1].m128_f32[3] + matrix.r[1].m128_f32[0],
32 matrix.r[2].m128_f32[3] + matrix.r[2].m128_f32[0],
33 matrix.r[3].m128_f32[3] + matrix.r[3].m128_f32[0]));
34
35 // Calculate right plane of frustum.
36 planes[3] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] - matrix.r[0].m128_f32[0],
37 matrix.r[1].m128_f32[3] - matrix.r[1].m128_f32[0],
38 matrix.r[2].m128_f32[3] - matrix.r[2].m128_f32[0],
39 matrix.r[3].m128_f32[3] - matrix.r[3].m128_f32[0]));
40
41 // Calculate top plane of frustum.
42 planes[4] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] - matrix.r[0].m128_f32[1],
43 matrix.r[1].m128_f32[3] - matrix.r[1].m128_f32[1],
44 matrix.r[2].m128_f32[3] - matrix.r[2].m128_f32[1],
45 matrix.r[3].m128_f32[3] - matrix.r[3].m128_f32[1]));
46
47 // Calculate bottom plane of frustum.
48 planes[5] = XMPlaneNormalize(XMVectorSet(matrix.r[0].m128_f32[3] + matrix.r[0].m128_f32[1],
49 matrix.r[1].m128_f32[3] + matrix.r[1].m128_f32[1],
50 matrix.r[2].m128_f32[3] + matrix.r[2].m128_f32[1],
51 matrix.r[3].m128_f32[3] + matrix.r[3].m128_f32[1]));
52
53 for (int i = 0; i < 6; i++)
54 {
55 m_planes[i] = planes[i];
56 }
57}
The documentation for this class was generated from the following files: