papalqi’s gists

papalqi / ResetImageDataToNewSize.cpp

Last active May 10, 2023 07:02

ResetImageDataToNewSize

	void Heightmap::GetHeightMapMipmapData(dynamic_array<SInt16>& heights, int mipLevel) const
	{
	float skipScale = 1 << mipLevel;
	int VertexNum = (GetResolution()-1);
	int MipmapVertexNum=VertexNum/skipScale;
	float scaleFactor = static_cast<float>(GetHeight() - 1) / (MipmapVertexNum - 1);
	heights.reserve(MipmapVertexNum*MipmapVertexNum);
	for (int y = 0; y < MipmapVertexNum; y++)
	{
	for (int x = 0; x < MipmapVertexNum; x++)

papalqi / GetBuildData.cpp

Last active March 9, 2022 02:16

GetBuildData


	const FMeshMapBuildData* GetMeshMapBuildData() const
	{
	AActor* Owner = GetOwner();
	if (Owner)
	{
	ULevel* OwnerLevel = Owner->GetLevel();

	if (OwnerLevel && OwnerLevel->OwningWorld)
	{

papalqi / GeneratePlatformVertexData.cpp

Last active January 30, 2024 19:09

GeneratePlatformVertexData.cpp

	void ULandscapeComponent::GeneratePlatformVertexData(const ITargetPlatform* TargetPlatform)
	{
	if (IsTemplate())
	{
	return;
	}
	check(GetHeightmap());
	check(GetHeightmap()->Source.GetFormat() == TSF_BGRA8);

	TArray<uint8> NewPlatformData;

papalqi / VSDF

Last active December 28, 2021 14:03

ShaderToy

	#define M void mainImage(out vec4 r,vec2 u){vec2 i=u-u;r-=r
	#define A texelFetch(iChannel0,ivec2(i+u),0)

	M;for(int k=0;++k<289;r+=A(.3-.03dot(i,i))exp(-.1dot(i,i)))i=vec2(k%17,k/17)-8.;r=iFrame<2?-u.xyxy:clamp(r,0.,1.);}

	M-A;}

papalqi / Graphics Programmers Tips.md

Last active December 28, 2021 06:33

Graphics Programmers Tips

当我们遇到图形问题时，需要一个清单列表来帮助我们逐个归类到底是那种问题类型。此清单将不停更新，以备日后参考。

1.1浮点问题

如果你观察条纹或摩尔纹，这表明可能是浮点精度问题。

有时候结果是完全错误的，而且远远超出了你的预期。在这种情况下，有必要仔细检查整个管道状态。

papalqi / SSAO.hlsl

Last active December 13, 2021 02:05

ssao

	// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

	/*=============================================================================
	PostprocessAmbientOcclusion.usf: To generate ambient occlusion as a postprocess
	=============================================================================*/

	#include "Common.usf"
	#include "PostProcessCommon.usf"
	#include "DeferredShadingCommon.usf"

papalqi / gist:3eec6a82c735741c7201f651365d68a5

Last active December 8, 2021 02:15

Gfur.md

We couldn’t find that file to show.

papalqi / GetUE4EnginePath.bat

Last active November 29, 2021 09:26

Get UE4 Engine Path

	@echo off

	setlocal EnableDelayedExpansion

	rem Get the Unreal Engine used by this project by querying the registry for the engine association found in the .uproject.
	set UNREAL_ENGINE=""
	set UPROJECT=""

	rem First find the .uproject
	for /f "delims=" %%A in (' powershell -Command "Get-ChildItem %~dp0../ -Depth 1 -Filter *.uproject -File \| %% {$_.FullName}" ') do set UPROJECT="%%A"