GlutsolidCube에 질감을 적용하는 방법

Question

정점 등을 지정하는 다각형에 텍스처를 매핑하는 것에 대한 튜토리얼을 찾을 수 있지만 Glut (glutsolidcube)로 그려진 큐브 (또는 다른 물건)에 질감을 적용하는 방법에 관한 것은 없습니다.

나는 다음과 같은 일을하고 있습니다.

glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal);
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, repeat);
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, repeat);
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, nearest);
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, nearest);

glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, 4, myImageWidth, myImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)myImage);

//...

glEnable(GL_TEXTURE_2D);

//now draw the cube
glutSolidCube(N);

이렇게하면 큐브에 텍스처를 적용 할 수 있지만 전체 큐브는 텍스처에서 첫 바이트의 색상을 얻습니다!

GlutsolidCube를 사용할 때 텍스처를 솔리드 큐브 (및 기타 고체)에 매핑하는 방법이 있습니까?

Answer 1

아니요 glutSolidCube() 텍스처 좌표를 생성하지 않습니다. 다행히도, glutSolidCube() 자신을 구현하고 텍스처 좌표를 추가하기 쉽습니다. 다음은 소스 코드입니다 glutSolidCube() 및 관련 기능 http://www.opengl.org/resources/libraries/glut/:

/* Copyright (c) Mark J. Kilgard, 1994, 1997. */

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(c) Copyright 1993, Silicon Graphics, Inc.                                      

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*/

static void
drawBox(GLfloat size, GLenum type)
{
  static GLfloat n[6][3] =
  {
    {-1.0, 0.0, 0.0},
    {0.0, 1.0, 0.0},
    {1.0, 0.0, 0.0},
    {0.0, -1.0, 0.0},
    {0.0, 0.0, 1.0},
    {0.0, 0.0, -1.0}
  };
  static GLint faces[6][4] =
  {
    {0, 1, 2, 3},
    {3, 2, 6, 7},
    {7, 6, 5, 4},
    {4, 5, 1, 0},
    {5, 6, 2, 1},
    {7, 4, 0, 3}
  };
  GLfloat v[8][3];
  GLint i;

  v[0][0] = v[1][0] = v[2][0] = v[3][0] = -size / 2;
  v[4][0] = v[5][0] = v[6][0] = v[7][0] = size / 2;
  v[0][1] = v[1][1] = v[4][1] = v[5][1] = -size / 2;
  v[2][1] = v[3][1] = v[6][1] = v[7][1] = size / 2;
  v[0][2] = v[3][2] = v[4][2] = v[7][2] = -size / 2;
  v[1][2] = v[2][2] = v[5][2] = v[6][2] = size / 2;

  for (i = 5; i >= 0; i--) {
    glBegin(type);
    glNormal3fv(&n[i][0]);
    glVertex3fv(&v[faces[i][0]][0]);
    glVertex3fv(&v[faces[i][1]][0]);
    glVertex3fv(&v[faces[i][2]][0]);
    glVertex3fv(&v[faces[i][3]][0]);
    glEnd();
  }
}

void APIENTRY
glutSolidCube(GLdouble size)
{
  drawBox(size, GL_QUADS);
}

전화로 추가하십시오 gltexcoord* 기능의 가족. Nehe OpenGL로 텍스처 매핑을 시작하는 방법에 대한 훌륭한 자습서가 있습니다.

Answer 2

실제로 하나의 해결책이 있습니다 ...

이와 같은 텍스처 코디네이트 생성을 사용할 수 있습니다

    glEnable(GL_TEXTURE_GEN_S); //enable texture coordinate generation
    glEnable(GL_TEXTURE_GEN_T);
    glBindTexture(GL_TEXTURE_2D, theTexture[2]);
    glutSolidCube(2);
    glDisable(GL_TEXTURE_GEN_S); //enable texture coordinate generation
    glDisable(GL_TEXTURE_GEN_T);

Answer 3

에 따르면 GLUT API 문서:

GlutsolidCube는 조명에 적합하지만 조명에 적합하지만 텍스처 좌표를 생성하지는 않습니다 (주전자 제외).