v So -- So if the gradient vector is perpendicular to v OK, that's a good start.
所以梯度向量垂直于,很好，这是一个很好的开始。
2
Click on the gradient Tool (g) and using a Black to 0% opacity gradient click and drag the gradient from the top of the photo to about where the mountains start.
选中渐变工具(G)，使用从黑色到0%不透明度的渐变，在图片上部点击并拖拉到山顶位置。
3
Hill-start Assist Control provides extra control when pulling away on a gradient, preventing the vehicle from rolling backwards.