角度限制The maximum allowed angle between the normals of adjacent faces before they're split off from each other.
A low limit will create lots of small UV islands with little distortion, while a high limit will create
a few large islands with potentially more distortion.
定距方法孤岛边距 参数的含义，该参数决定 UV 孤岛之间空白空间的大小。
已缩放The Island Margin is a more or less arbitrary measure with no direct relation to the sizes of the
UV islands or the texture.
相加As above, but without the internally calculated scaling factor.
分数The Island Margin is a fraction of the UV unit square. This means that, if you have a 1024x1024
texture and set the Island Margin to 1/1024, each UV island will have a margin of 1 pixel around it
(and islands will be no closer than 2 pixels to each other).
旋转方法
轴对齐自动旋转，以避免浪费空间。
轴对齐 (水平)旋转孤岛以水平对齐。
轴对齐 (垂直)旋转孤岛以垂直对齐。
孤岛边距孤岛之间留出多少空隙。由 定距方法 控制。
区域权重如果取值为 0，每个面群组的投影矢量只是其面法线的平均值。如果取值为 1，则是根据面的面积加权后的平均值。其他值则介于两者之间。
校正高宽比例调整 UV 贴图，以考虑与材质相关的图像的长宽比。这样可以确保在非正方形纹理上展开 UV 时能正确缩放。
要使该选项生效，网格必须有一个带有图像纹理节点的材质，并且该节点必须在着色器编辑器中被选中。
缩放至边界框拉伸生成的 UV 贴图以填充整个纹理。