컴퓨터 그래픽스 과제정리 (OpenGL)

알감자·2022년 6월 8일
CGOpenGL컴그컴퓨터그래픽스
0

게임공부

목록 보기
17/22

과제 1

1. XYZ축 그리기

////////////////draw XYZ
void DrawXYZ()
{
	glDisable(GL_LIGHTING);

	//x축 그리기 (빨간색)
	glColor3f(1.f, 0.f, 0.f);
	glBegin(GL_LINE_LOOP);
	glVertex3f(10.0, 0.0, 0.0);
	glVertex3f(-10.0, 0.0, 0.0);
	glEnd();

	//y축 그리기 (초록색)
	glColor3f(0.f, 1.f, 0.f);
	glBegin(GL_LINE_LOOP);
	glVertex3f(0.0, 10.0, 0.0);
	glVertex3f(0.0, -10.0, 0.0);
	glEnd();

	//z축 그리기 (파란색)
	glColor3f(0.f, 0.f, 1.f);
	glBegin(GL_LINE_LOOP);
	glVertex3f(0.0, 0.0, 10.0);
	glVertex3f(0.0, 0.0, -10.0);
	glEnd();

}

2. 정육면체 그리기

삼각형을 그리는 함수를 만든 뒤 그 함수를 이용하서 사각형을 만드는 함수를 만든다. 사각형을 만드는 함수를 이용하여 정육면체를 그리면 된다.

void DrawTriangle(GLfloat I)
{
	glColor3f(0.2f, 0.2f, 0.6f);
	glBegin(GL_TRIANGLES);
	glNormal3f(0.0, 0.0, 1.0);
	glVertex3f(0.0, 0.0, 0.0);
	glNormal3f(0.0, 0.0, 1.0);
	glVertex3f(I, 0.0, 0.0);
	glNormal3f(0.0, 0.0, 1.0);
	glVertex3f(0.0, I, 0.0);
	glEnd();

}

void DrawSquare(GLfloat I)
{
	glPushMatrix();
	glTranslatef(-0.5 * I, -0.5 * I, 0.5 * I);
	DrawTriangle(I);
	glPopMatrix();

	glPushMatrix();
	glRotatef(180.0, 0.0, 0.0, 1.0);
	glTranslatef(-0.5 * I, -0.5 * I, 0.5 * I);
	DrawTriangle(I);
	glPopMatrix();
}

void DrawCube(GLfloat I)
{
	glPushMatrix();
	DrawSquare(I);
	glRotatef(90.0, 0.0, 1.0, 0.0);
	DrawSquare(I);
	glRotatef(90.0, 0.0, 1.0, 0.0);
	DrawSquare(I);
	glRotatef(90.0, 0.0, 1.0, 0.0);
	DrawSquare(I);
	glPopMatrix();

	glPushMatrix();
	glRotatef(90.0, 1.0, 0.0, 0.0);
	DrawSquare(I);
	glRotatef(180.0, 1.0, 0.0, 0.0);
	DrawSquare(I);
	glPopMatrix();

}

3. 두 개의 OpenGL 광원 적용

DrawScene 함수 안에서 구현. 숫자 3을 누르면 실행되게 했다.

if (b_number_3)
	{
		glEnable(GL_LIGHTING);
		glDisable(GL_LIGHT0);
		glDisable(GL_LIGHT3);
		glDisable(GL_LIGHT4);
		glEnable(GL_LIGHT1);
		glEnable(GL_LIGHT2);
		GLfloat light12_ambient[] = { 0.5f, 0.5f, 0.9f, 1.0f };
		GLfloat light12_diffuse[] = { 0.2f, 0.2f, 0.2f, 1.0f };
		GLfloat light12_position[] = { 3.0f, 3.0f, 6.0f, 1.0f };
		GLfloat mat0_noemission[] = { 0.0f, 0.0f, 0.0f, 1.0f };

		GLfloat mat0_shininess[] = { 50.0 };
		GLfloat mat0_properties[2][4] =
		{
		{0.3f, 0.3f, 0.3f, 1.0f}, //ambient 
		{0.2f, 0.2f, 0.2f, 1.0f}, //diffuse
		};

		glLightfv(GL_LIGHT1, GL_AMBIENT, light12_ambient);
		glLightfv(GL_LIGHT2, GL_DIFFUSE, light12_diffuse);
		glLightfv(GL_LIGHT2, GL_POSITION, light12_position);

		glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat0_shininess);
		glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mat0_properties[mat_diffuse]);
		glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat0_properties[mat_ambient]);
		glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, mat0_noemission);
	}

4. Spotlight가 정육면체 주변을 돌면서 정육면체를 비추도록 하기

숫자 4를 누르면 실행되게 했다.

	if (b_number_4)
	{
		glEnable(GL_LIGHTING);
		glDisable(GL_LIGHT1);
		glDisable(GL_LIGHT2);
		glEnable(GL_LIGHT0);

		GLfloat spotlight_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };
		GLfloat spotlight_diffuse[] = { 0.2f, 0.2f, 0.7f, 1.0f };
		GLfloat spotlight_specular[] = { 0.3f, 0.3f, 0.3f, 1.0f };
		GLfloat mat0_no[] = { 0.3f, 0.3f, 0.3f, 1.0f };
		GLfloat spotlight_direction[] = { 0.0f, 0.0f, -1.0f, 1.0f };
		GLfloat mat0_noemission[] = { 0.0f, 0.0f, 0.0f, 1.0f };

		glLightfv(GL_LIGHT0, GL_SPECULAR, spotlight_specular);
		glLightfv(GL_LIGHT0, GL_DIFFUSE, spotlight_diffuse);
		glLightfv(GL_LIGHT0, GL_AMBIENT, spotlight_ambient);
		glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 80.0f);
		glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 80.0f);
		glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotlight_direction);

		glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mat0_no);
		glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat0_no);
		glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, mat0_noemission);

		spot_angle += 0.1f;
		glPushMatrix();
		glTranslatef(0.0, 0.0, 0.0);
		glRotatef(spot_angle, 0, 0, 1);
		GLfloat lightpos[4] = { 1.0f, 1.0f, 10.0f, 1.0f };
		glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
		glPopMatrix();
		glDisable(GL_LIGHT3);
		glDisable(GL_LIGHT4);
	}

5. 정육면체에 GL_EMISSION을 적용

숫자 5를 누르면 실행되게 함.

if (b_number_5)
	{
		glEnable(GL_LIGHTING);
		glEnable(GL_LIGHT3);
		glEnable(GL_LIGHT4);
		glDisable(GL_LIGHT0);
		glDisable(GL_LIGHT1);
		glDisable(GL_LIGHT2);

		////light 3,4 설정
		GLfloat light_emission[] = { 0.5f, 0.6f, 0.2f, 1.0f };  //emission
		GLfloat light34_ambient[] = { 0.1f, 0.1f, 0.1f, 1.f };
		GLfloat light34_diffuse[] = { 0.3f, 0.3f, 0.3f, 1.f };
		GLfloat mat0_shininess[] = { 50.0 };
		GLfloat mat0_no[] = { 0.3f, 0.3f, 0.3f, 1.0f };

		glLightfv(GL_LIGHT3, GL_DIFFUSE, light34_ambient);
		glLightfv(GL_LIGHT4, GL_AMBIENT, light34_diffuse);

		glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, light_emission);
		glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat0_shininess);
		glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mat0_no);
		glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat0_no);
	}

과제 2

Texture Mapping

void DrawGLScene() {
	gluLookAt(0.f, 30.f, m_cameraDist, 0.f, 0.f, 0.f, 0.f, 1.f, 0.f);

	if (b_mouseMove) {
		glRotatef(angleVelocity * (m_currentPoint.x - m_anchorPoint.x), 0.0, 1.0, 0.0);
		glRotatef(angleVelocity * (m_currentPoint.y - m_anchorPoint.y), 1.0, 0.0, 0.0);
	}

	BuildCheckerImage();

	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
	glTexImage2D(GL_TEXTURE_2D, 0, 3,
		checkerImageWidth, checkerImageHeight, 0, GL_RGB,
		GL_UNSIGNED_BYTE, &checkerImage[0][0][0]);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

	//up
	glEnable(GL_TEXTURE_2D);
	CString fname("image\\up.bmp");
	BindTextureFile((LPCSTR)fname, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(-500.0, 500.0, 500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(500.0, 500.0, 500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	//down
	glEnable(GL_TEXTURE_2D);
	CString fname1("image\\down.bmp");
	BindTextureFile((LPCSTR)fname1, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(-500.0, -500.0, 500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-500.0, -500.0, -500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(500.0, -500.0, -500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(500.0, -500.0, 500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	glEnable(GL_TEXTURE_2D);
	CString fname2("image\\left.bmp");
	BindTextureFile((LPCSTR)fname2, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(-500.0, 500.0, 500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(-500.0, -500.0, -500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(-500.0, -500.0, 500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	glEnable(GL_TEXTURE_2D);
	CString fname3("image\\right.bmp");
	BindTextureFile((LPCSTR)fname3, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(500.0, 500.0, 500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(500.0, -500.0, -500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(500.0, -500.0, 500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	glEnable(GL_TEXTURE_2D);
	CString fname4("image\\front.bmp");
	BindTextureFile((LPCSTR)fname4, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(-500.0, -500.0, 500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-500.0, 500.0, 500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(500.0, 500.0, 500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(500.0, -500.0, 500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	glEnable(GL_TEXTURE_2D);
	CString fname5("image\\back.bmp");
	BindTextureFile((LPCSTR)fname5, 0);
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(-500.0, -500.0, -500.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(500.0, 500.0, -500.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(500.0, -500.0, -500.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	//draw Box1
	glEnable(GL_TEXTURE_2D);
	CString fname7("image\\crate.bmp");
	BindTextureFile((LPCSTR)fname7, 0);
	glBegin(GL_QUADS);
	//front
	glTexCoord2f(0.0, 1.0);			glVertex3f(0.0, 0.0, 10.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(0.0, 10.0, 10.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(10.0, 10.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(10.0, 0.0, 10.0);
	glEnd();

	//back
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(0.0, 10.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(10.0, 10.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(10.0, 0.0, 0.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(0.0, 0.0, 0.0);
	glEnd();

	//up
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(0.0, 10.0, 10.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(0.0, 10.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(10.0, 10.0, 0.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(10.0, 10.0, 10.0);
	glEnd();

	//down
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(0.0, 0.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(10.0, 0.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(10.0, 0.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(0.0, 0.0, 10.0);
	glEnd();

	//left -> 1번씩 당긴거
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(0.0, 0.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(0.0, 10.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(0.0, 10.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(0.0, 0.0, 10.0);
	glEnd();

	//right
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(10.0, 10.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(10.0, 0.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(10.0, 0.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(10.0, 10.0, 10.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);
	//draw Box1 finish

	//draw Box2
	glEnable(GL_TEXTURE_2D);
	CString fname8("image\\crate.bmp");
	BindTextureFile((LPCSTR)fname8, 0);
	//down
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(5.0, 10.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(15.0, 10.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(15.0, 10.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(5.0, 10.0, 10.0);
	glEnd();

	//up
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(5, 20.0, 10.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(5, 20.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(15, 20.0, 0.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(15, 20.0, 10.0);
	glEnd();

	//front
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(5, 10.0, 10.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(5, 20.0, 10.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(15, 20.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(15, 10.0, 10.0);
	glEnd();

	//back
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(5.0, 20.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(15.0, 20.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(15.0, 10.0, 0.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(5.0, 10.0, 0.0);
	glEnd();

	//left
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(5, 10.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(5, 20.0, 0.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(5, 20.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(5, 10.0, 10.0);
	glEnd();

	//right
	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 1.0);			glVertex3f(15, 20.0, 0.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(15, 20.0, 10.0);
	glTexCoord2f(1.0, 0.0);			glVertex3f(15, 10.0, 10.0);
	glTexCoord2f(1.0, 1.0);			glVertex3f(15, 10.0, 0.0);
	glEnd();
	glDisable(GL_TEXTURE_2D);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

	//draw grass
	glEnable(GL_TEXTURE_2D);
	CString fname9("image\\grass.bmp");
	BindTextureFile((LPCSTR)fname9, 0);

	glBegin(GL_QUADS);
	glTexCoord2f(0.0, 80.0);			glVertex3f(-50.0, 0.0, -50.0);
	glTexCoord2f(0.0, 0.0);			glVertex3f(-50.0, 0.0, 50.0);
	glTexCoord2f(80.0, 0.0);			glVertex3f(50.0, 0.0, 50.0);
	glTexCoord2f(80.0, 80.0);			glVertex3f(50.0, 0.0, -50.0);
	glEnd();

	glDisable(GL_TEXTURE_2D);

}
profile
알감자
이전 포스트

CS 질문 정리

다음 포스트

A* 알고리즘

0개의 댓글