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e75acb9b8a
CL 2699552 added SvPositionToTranslatedWorld for better quality and performance, some refactoring [CL 2699586 by Martin Mittring in Main branch]
20 lines
732 B
Plaintext
20 lines
732 B
Plaintext
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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VelocityCommon.usf: Common functions for calculating velocity vectors.
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=============================================================================*/
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#pragma once
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float2 Calculate2DVelocity(float4 PackedVelocityA, float4 PackedVelocityC)
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{
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float2 ScreenPos = PackedVelocityA.xy / PackedVelocityA.w - View.ViewToClip[2].xy;
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float2 PrevScreenPos = PackedVelocityC.xy / PackedVelocityC.w - View.PrevProjection[2].xy;
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// 2d velocity, includes camera an object motion
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float2 Velocity = ScreenPos - PrevScreenPos;
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// Make sure not to touch 0,0 which is clear color
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return Velocity;
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}
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