Question

我正在尝试制作一个能够绘制具有指定大小和纹理的立方体的方法。问题是，当我调整立方体的大小时，纹理不会随之重新调整大小。例如，如果我使用大小.5F绘制，则只有8x8像素的16x16纹理绘制。我做错了什么？

static void drawCube(float size, Texture tex, int x, int y, int z) {
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glTranslatef(x, y, z);

    tex.bind();
    glPolygonMode(GL_FRONT, GL_FILL);

    glBegin(GL_QUADS);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, 1.0f * size);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, 1.0f * size);
    glEnd();

    glBegin(GL_QUADS);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, -1.0f * size);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, -1.0f * size);
    glEnd();

    glBegin(GL_QUADS);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, -1.0f * size);
    glEnd();

    glBegin(GL_QUADS);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, 1.0f * size);
    glEnd();

    glBegin(GL_QUADS);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, -1.0f * size);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, -1.0f * size);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(1.0f * size, 1.0f * size, 1.0f * size);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(1.0f * size, -1.0f * size, 1.0f * size);
    glEnd();


    glBegin(GL_QUADS);
    glTexCoord2d(0.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, -1.0f * size);
    glTexCoord2d(1.0f * size, 0.0f * size);
    glVertex3f(-1.0f * size, -1.0f * size, 1.0f * size);
    glTexCoord2d(1.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, 1.0f * size);
    glTexCoord2d(0.0f * size, 1.0f * size);
    glVertex3f(-1.0f * size, 1.0f * size, -1.0f * size);
    glEnd();

    glTranslatef(-x, -y, -z);
}

Answer 1

纹理坐标始终使用[0..1]坐标系。如果要绘制完整纹理，请不要根据大小缩放纹理坐标，即

glTexCoord2d(1.0f * size, 0.0f * size); // Not good! (For this purpose anyway)
glTexCoord2d(1.0f, 0.0f); // Good!

OpenGL LWJGL重新调整大小的纹理立方体

1 个答案: