void RebuildSkyMatrices(float nearPlane, float farPlane)
{
if (!m_SkySettings)
{
return;
}
Matrix4x4 cubeProj = Matrix4x4.Perspective(90.0f, 1.0f, nearPlane, farPlane);
// Ref: https://msdn.microsoft.com/en-us/library/windows/desktop/bb204881(v=vs.85).aspx
Vector3[] lookAtList =
{
new Vector3(1.0f, 0.0f, 0.0f),
new Vector3(-1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, -1.0f, 0.0f),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, 0.0f, -1.0f),
};
Vector3[] upVectorList =
{
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 0.0f, -1.0f),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
};
for (int i = 0; i < 6; ++i)
{
Matrix4x4 lookAt = Matrix4x4.LookAt(Vector3.zero, lookAtList[i], upVectorList[i]);
Matrix4x4 worldToView = lookAt * Matrix4x4.Scale(new Vector3(1.0f, 1.0f, -1.0f)); // Need to scale -1.0 on Z to match what is being done in the camera.wolrdToCameraMatrix API. ...
Vector4 screenSize = new Vector4((int)m_SkySettings.resolution, (int)m_SkySettings.resolution, 1.0f / (int)m_SkySettings.resolution, 1.0f / (int)m_SkySettings.resolution);
m_faceWorldToViewMatrixMatrices[i] = worldToView;
m_facePixelCoordToViewDirMatrices[i] = ComputePixelCoordToWorldSpaceViewDirectionMatrix(0.5f * Mathf.PI, screenSize, worldToView, true);
m_faceCameraInvViewProjectionMatrix[i] = Utilities.GetViewProjectionMatrix(lookAt, cubeProj).inverse;
}
}
void RebuildSkyMeshes(float nearPlane, float farPlane)
{
if (m_CubemapFaceMesh[0] == null)
{
Matrix4x4 cubeProj = Matrix4x4.Perspective(90.0f, 1.0f, nearPlane, farPlane);
Vector3[] lookAtList =
{
new Vector3(1.0f, 0.0f, 0.0f),
new Vector3(-1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, -1.0f, 0.0f),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, 0.0f, -1.0f),
};
Vector3[] UpVectorList =
{
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 0.0f, -1.0f),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, 1.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
};
for (int i = 0; i < 6; ++i)
{
Matrix4x4 lookAt = Matrix4x4.LookAt(Vector3.zero, lookAtList[i], UpVectorList[i]);
m_faceCameraViewProjectionMatrix[i] = Utilities.GetViewProjectionMatrix(lookAt, cubeProj);
m_faceCameraInvViewProjectionMatrix[i] = m_faceCameraViewProjectionMatrix[i].inverse;
m_CubemapFaceMesh[i] = BuildSkyMesh(Vector3.zero, m_faceCameraInvViewProjectionMatrix[i]);
}
}
}
