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Re-use existing code

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Signed-off-by: Yuriy Toporovskyy <toporovskyy.y@gmail.com>
This commit is contained in:
Yuriy Toporovskyy
2021-08-04 17:38:19 -04:00
parent bf361c2c13
commit 83e43dd517
1 changed files with 7 additions and 23 deletions
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Gems/Camera/Code/Source/CameraSystemComponent.cpp
+7 -23
View File
@@ -10,6 +10,8 @@
#include <AzCore/Math/MatrixUtils.h>
#include <AzCore/Component/TransformBus.h>
#include <AzFramework/Viewport/CameraState.h>
#include <Atom/RPI.Public/View.h>
#include <Atom/RPI.Public/ViewportContextBus.h>
@@ -87,30 +89,12 @@ namespace Camera
{
if (auto view = viewSystem->GetCurrentView(viewSystem->GetDefaultViewportContextName()))
{
const auto& viewToClip = view->GetViewToClipMatrix();
cfg.m_fovRadians = AZ::GetPerspectiveMatrixFOV(viewToClip);
AzFramework::CameraState cam;
AzFramework::SetCameraClippingVolumeFromPerspectiveFovMatrixRH(cam, view->GetViewToClipMatrix());
// A = f / (n - f)
// B = n * f / (n - f)
// Then...
// B / A
// = (n * f / (n - f)) / (f / (n - f))
// = (n * f) / (f)
// = n
// and...
// n * f / (n - f) = B
// n * ((n - f) / f)^-1 = B
// n * (n/f - 1)^-1 = B
// (n/f - 1)^-1 = B/n
// n/f - 1 = n/B
// f = n/(n/B + 1)
const float A = viewToClip.GetElement(2, 2);
const float B = viewToClip.GetElement(2, 3);
cfg.m_nearClipDistance = B / A;
cfg.m_farClipDistance = cfg.m_nearClipDistance / (cfg.m_nearClipDistance / B + 1.f);
// NB: assumes reversed depth!
AZStd::swap(cfg.m_farClipDistance, cfg.m_nearClipDistance);
cfg.m_fovRadians = cam.m_fovOrZoom;
cfg.m_nearClipDistance = cam.m_nearClip;
cfg.m_farClipDistance = cam.m_farClip;
// No idea what to do here. Seems to be unused?
cfg.m_frustumWidth = cfg.m_frustumHeight = 1.0f;