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畫出來(lái)的坐標(biāo)軸只有正半軸，有什么講究？ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glLoadIdentity(); // 重置當(dāng)前模型觀察矩陣 glTranslatef(0.0f,0.0f,-1.0f); glRotatef(30.0f,1.0f,0.0f,0.0f); // 繞x軸旋轉(zhuǎn)30 glRotatef(-30.0f,0.0f,1.0f,0.0f); // 繞y軸旋轉(zhuǎn)30度 glColor3f(1.0f,0.0f,0.0f); glBegin(GL_LINES); glVertex3f(-0.5f,0.0f,0.0f); glVertex3f(0.5f,0.0f,0.0f); glEnd(); glColor3f(0.0f,1.0f,0.0f); glBegin(GL_LINES); glVertex3f(0.0f,-0.5f,0.0f); glVertex3f(0.0f,0.5f,0.0f); glEnd(); glColor3f(0.0f,0.0f,1.0f); glBegin(GL_LINES); glVertex3f(0.0f,0.0f,-0.5f); glVertex3f(0.0f,0.0f,0.5f); glEnd(); 什么說(shuō)只有負(fù)半軸???
你確定它畫的只有半軸而不是全部線的長(zhǎng)度... 如果你確定了的話, 會(huì)不會(huì)是投影體設(shè)的太小... 剩下的線跑視見(jiàn)體外面去了.. |
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