opengl 纹理立方体 c++

发布于 2024-08-29 13:16:38 字数 812 浏览 1 评论 0 原文

你好，我创建了一个立方体，并希望在一侧有纹理。

glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, texture[0]);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMode);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMode);

        glBegin(GL_POLYGON);   //Vorderseite
    glColor4f(1.0f,0.0f,0.0f,1.0f); //ROT
    glVertex3f(-fSeitenL/2.0f,-fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,1.0f,0.0f,1.0f); //GELB
    glVertex3f(+fSeitenL/2.0f,-fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,1.0f,1.0f,1.0f); //WEISS
    glVertex3f(+fSeitenL/2.0f,+fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,0.0f,1.0f,1.0f); //MAGENTA
    glVertex3f(-fSeitenL/2.0f,+fSeitenL/2.0f,+fSeitenL/2.0f);
    glEnd();

    glDisable(GL_TEXTURE_2D);

但我看不到我的纹理，我做错了什么？谢谢。

原文

hello i create a cube and want on one side an texture.

glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, texture[0]);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMode);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMode);

        glBegin(GL_POLYGON);   //Vorderseite
    glColor4f(1.0f,0.0f,0.0f,1.0f); //ROT
    glVertex3f(-fSeitenL/2.0f,-fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,1.0f,0.0f,1.0f); //GELB
    glVertex3f(+fSeitenL/2.0f,-fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,1.0f,1.0f,1.0f); //WEISS
    glVertex3f(+fSeitenL/2.0f,+fSeitenL/2.0f,+fSeitenL/2.0f);
    glColor4f(1.0f,0.0f,1.0f,1.0f); //MAGENTA
    glVertex3f(-fSeitenL/2.0f,+fSeitenL/2.0f,+fSeitenL/2.0f);
    glEnd();

    glDisable(GL_TEXTURE_2D);

but i can't see my texture, what did i wrong?
thanks.

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好久不见√ 2024-09-05 13:16:38

您尚未提供纹理坐标。您需要先调用一次 glTexCoord（2f 变体是最常用的）来指示矢量映射到的纹理的一部分，相应的glVertex调用。

否则，OpenGL 不知道如何将纹理粘贴到多边形上。

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飘过的浮云 2024-09-05 13:16:38

首先，这看起来不是一个立方体，而只是一个四边形，一个立方体是由6个不同的四边形组成的..（并且您可以使用GL_QUADS code> 而不是 GL_POLYGON

第二件事是您正在加载纹理但不将其映射到顶点您需要提供坐标来映射纹理应如何适合四边形。使用的

glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);

示例取自 NEHE OpenGL 指南，我真的建议您看一下，因为它解释得很好：http://nehe.gamedev.net

查看有关纹理映射的教程 6：http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=06

First of all this doesn't seem a cube but just a quad, a cube is made by 6 different quads.. (and you could use GL_QUADS instead that GL_POLYGON.

Second thing is that you are loading the texture but not mapping it to the vertices. You need to supply coordinates to map how the texture should fit onto the quad. You can do it by using

glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);

the example is taken from NEHE OpenGL guide and I really suggest you to take a look since it's quite well explained: http://nehe.gamedev.net

Check tutorial 6 about texture mapping: http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=06

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