Kiyoung Moon

Saturday, August 10, 2024

Task in UnrealEngine

https://www.youtube.com/watch?v=1lBadANnJaw

Monday, December 11, 2023

One Frame Animation

SkeletalMesh->PlayAnimation(MyAnim, false);
SkeletalMesh->bPauseAnims = true;
UAnimSingleNodeInstance* Inst = Cast<UAnimSingleNodeInstance>(AnimInstance);
if ( Inst )
{
Inst->SetPosition(AnimTime);
}

Wednesday, November 22, 2023

Compile MD5 using openssl on linux

cc digestMD5.c -o digestMd5 -L/usr/openssl/lib64 -lssl -lcrypto -ldl

I installed openssl into /usr/openssl

Or openssl is located in /opt/openssl

Sunday, September 24, 2023

The Greek Alphabet, english pronunciation for math

https://www.youtube.com/watch?v=PStgY5AcEIw

Wednesday, September 13, 2023

Baseball terms

심판 - Umpire

투수 - Pitcher

포수 - Catcher

타자 - Batter

지명타자 - Designated hitter

1루수 - First baseman

2루수 - Second baseman

3루수 - Third baseman

유격수 - Shortstop

좌익수 - Left fielder

중견수 - Center fielder

우익수 - Right fielder

중간계투/구원투수 - Bullpen pitcher

마무리투수 - Closer

주자 - Runner

눈치채셨겠지만

1루는 First base

2루는 Second base

3루는 Third base 입니다.

공을던지다 - Pitch the ball

공을 치다 - Hit the ball

파울 - foul ball

1루타 - single

2루타 - double

3루타 - triple

내야안타 - infield hit

홈런 - homerun

만루홈런 - grand slam

도루 - Stolen base

볼넷 - base on balls

삼진 - Strike out

직구 - Fast ball

변화구 - Breaking ball

내야 땅볼 - Ground out

직선타구 - Line drive

뜬공 - Fly ball

견제구 - Pick-off throw

땅볼 - Ground ball

Monday, August 28, 2023

VisualStudio : Find a location in Solution Explorer

Ctrl + [, S

Thursday, August 24, 2023

Collision detection : Circle vs Rectangle

detection only

int CheckHit( F_RECT *prcRect1, F_CIRCLE *pcrCircle2 )

{

int nResult = false;

float ar;

if ( ( pcrCircle2->x > prcRect1->fLeft - pcrCircle2->r ) &&

( pcrCircle2->x < prcRect1->fRight + pcrCircle2->r ) &&

( pcrCircle2->y > prcRect1->fTop - pcrCircle2->r ) &&

( pcrCircle2->y < prcRect1->fBottom + pcrCircle2->r ) )

{

nResult = true;

ar = pcrCircle2->r;

if ( pcrCircle2->x < prcRect1->fLeft ) {

if ( ( pcrCircle2->y < prcRect1->fTop ) )

{

if ( ( DistanceSqr( prcRect1->fLeft, prcRect1->fTop,

pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

nResult = false;

}

else {

if ( ( pcrCircle2->y > prcRect1->fBottom ) )

{

if ( ( DistanceSqr( prcRect1->fLeft, prcRect1->fBottom,

pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

nResult = false;

}

else {

if ( pcrCircle2->x > prcRect1->fRight ) {

if ( ( pcrCircle2->y < prcRect1->fTop ) )

{

if ( ( DistanceSqr( prcRect1->fRight, prcRect1->fTop,

pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

nResult = false;

}

else {

if ( ( pcrCircle2->y > prcRect1->fBottom ) )

{

if ( ( DistanceSqr( prcRect1->fRight, prcRect1->fBottom,

pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

nResult = false;

}

return nResult;

}

Wednesday, August 9, 2023

대화의 격률

https://ko.wikipedia.org/wiki/%EA%B7%B8%EB%9D%BC%EC%9D%B4%EC%8A%A4%EC%9D%98_%EB%8C%80%ED%99%94%EA%B2%A9%EB%A5%A0

Monday, July 31, 2023

Unreal Engine's DrawDebugCone

There are two versions of implementation of DrawDebugCone.

One it takes two angles in radians and other one takes degrees. OTL

Tuesday, July 11, 2023

Order of mov (assembler)

mov ax, 3

which mean move a number 3 into ax register. This is an intel assembler order.

Other assembler use opposite order for instance

mov 3, ax

which is exactly same meanning like shown above.

Monday, July 10, 2023

three types of locks

1. Try lock

try it only once

2. Spin lock

try forever until it acquires the lock

3. Timeout lock

try it for up to some period of time

Sunday, July 9, 2023

UGameplayStatics, Static class with useful gameplay utility functions

Wednesday, July 5, 2023

Unreal engine naming conventions

https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/AssetNaming/

Thursday, June 29, 2023

implement add with + operator with racket

#lang racket

; implement add without + operator

(define add

(λ (n m)

(cond

((zero? m) n)

(else (add1

(add n (sub1

m)))))))

One thing I want to notice is that add1 and sub1 are not what I defined myself.

racket basic

#lang racket

; define a constant

(define myval 3.14)

; function without param

(define myfunc

(λ ()

(+ 3 4)))

; call function

(myfunc)

; function with param(which is one formal)

(define myfunc-mul-two

(λ (x)

(* 2 x)))

(myfunc-mul-two 4)

; outer function calls inner function

(define double-result-of-f

(λ (f)

(λ (z)

(* 2 (f z)))))

(define add3

(λ (x)

(+ 3 x)))

((double-result-of-f add3) 4)

Thursday, June 22, 2023

binary search alternative

#include <iostream>

#include <vector>

using namespace std;

int main()

{

int array[] = { 1,3,3,4,5,5,6,9,10,12,12,15 };

int n = sizeof(array) / sizeof(int);

int k = 0;

int x = 3;

for (int b = n / 2; b >= 1; b /= 2)

{

while (k + b < n && array[k + b] <= x)

{

k += b;

}

if (array[k] == x)

{

int a = 10;

}

remainder in racket

#lang racket

(define remainder

(λ (x y)

(cond

((< x y) x)

(else (remainder (- x y) y)))))

Wednesday, June 21, 2023

which is used to locate a command. which returns the pathnames of the files (or links) which would be executed in the current environment, had its arguments been given as commands in a strictly POSIX-conformant shell. It does this by searching the PATH for executable files matching the names of the arguments. It does not follow symbolic links.

Sunday, June 18, 2023

unreal engine gpu profiling commands

stat gpu

stat rhi

stat unit

ProfileGPU