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所以我有一个分配,我必须将一个旋转轴作为垂直于该平面的法向量返回。这里是我的代码:返回一个glm :: vec3 x值返回null
glm::vec3 Skeleton::returnAxis()
{
GLdouble firstPoint[3];
GLdouble secondPoint[3];
GLdouble thirdPoint[3];
GLint viewport[4];
GLdouble modelview[16];
GLdouble projection[16];
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
glGetDoublev(GL_PROJECTION_MATRIX, projection);
glGetIntegerv(GL_VIEWPORT, viewport);
gluUnProject(0,0,0, modelview, projection, viewport, &firstPoint[0], &firstPoint[1], &firstPoint[2]);
gluUnProject(viewport[2], 0 ,0, modelview, projection, viewport, &secondPoint[0], &secondPoint[1], &secondPoint[2]);
gluUnProject(0,viewport[3],0, modelview, projection, viewport, &thirdPoint[0], &thirdPoint[1], &thirdPoint[2]);
glm::vec3 point1 = glm::vec3(secondPoint - firstPoint);
glm::vec3 point2 = glm::vec3(thirdPoint - firstPoint);
glm::vec3 axis = glm::normalize(glm::cross(point1, point2));
return axis;
std::cout << axis.x;
}
问题是,它没有返回任何数字!只是空白。即使在我做了一个类型转换(在上面的代码中没有显示)之后。
帮助!
谢谢!!!!工作:D –