C++ 如何在opengl中在y或x轴上绘制圆柱体
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How to draw cylinder in y or x axis in opengl
提问by brtb
I just want to draw a cylinder in opengl. I found lots of samples but all of them draws cylinders in z axis. I want them be in x or y axis. How can i do this. The code below is the code draw the cylinder in z direction and i dont want it
我只想在opengl中画一个圆柱体。我发现了很多样本，但所有样本都在 z 轴上绘制圆柱体。我希望它们在 x 或 y 轴上。我怎样才能做到这一点。下面的代码是在 z 方向绘制圆柱体的代码，我不想要它
GLUquadricObj *quadratic;
quadratic = gluNewQuadric();
gluCylinder(quadratic,0.1f,0.1f,3.0f,32,32);
采纳答案by micha
You can use glRotate(angle, x, y, z)to rotate your coordinate system:
您可以使用glRotate(angle, x, y, z)旋转坐标系：
GLUquadricObj *quadratic;
quadratic = gluNewQuadric();
glRotatef(90.0f, 0.0f, 1.0f, 0.0f);
gluCylinder(quadratic,0.1f,0.1f,3.0f,32,32);
回答by nickolay
On every render use glPushMatrixglRotatefdraw the cylinder and finish your drawing with glPopMatrix.
在每次渲染时使用glPushMatrixglRotatef绘制圆柱体并使用glPopMatrix.
Ex.: glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate your object around the y axis on yRotationAngle radians
前任。： glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate your object around the y axis on yRotationAngle radians
Ex.: OnRender()function example
例如：OnRender()功能示例
void OnRender() {
glClearColor(1.0f, 0.0f, 0.0f, 1.0f); // Clear the background
glClear(GL_COLOR_BUFFER_BIT); //Clear the colour buffer
glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate our object around the y axis on yRotationAngle radians
// here *render* your cylinder (create and delete it in the other place. Not while rendering)
gluCylinder(quadratic,0.1f,0.1f,3.0f,32,32);
glFlush(); // Flush the OpenGL buffers to the window
}
