C++ (Cpp) glm::length示例

示例#1

文件： glwidget.cpp 项目： joshatron/CSCI-441-Labs

void GLWidget::mouseMoveEvent(QMouseEvent *event) {
    last.x = event->x();
    last.y = event->y();

    vec3 begin = pointOnVirtualTrackball(first);
    vec3 end = pointOnVirtualTrackball(last);

    float dotProduct = dot(normalize(begin), normalize(end));
    float angle = acos(dotProduct);
    vec3 crossP = cross(begin, end);

    if(length(crossP) > .00001f)
    {
        rotationMatrix = rotate(mat4(1.0), angle, normalize(crossP)) * rotationMatrix;
        glUseProgram(cubeProg);
        glUniformMatrix4fv(cubeRotationMatrixLoc, 1, false, value_ptr(rotationMatrix));
        glUseProgram(gridProg);
        glUniformMatrix4fv(gridRotationMatrixLoc, 1, false, value_ptr(rotationMatrix));
        update();
    }


    first.x = last.x;
    first.y = last.y;
}