画高次等参单元彩色云图的关键是计算单元覆盖像素的自然坐标。

The key of plotting colored patterns of high order isoparametric elements is to calculate the nature coordinates of pixels spanned by elements.

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像素着色起计算从眼睛到被画矩形的光线。

The pixel shader computes a ray from the eye to the pixel being drawn on the quad.

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画上鼻子眼睛等，使用2像素的笔刷给娃娃画两根头发。

Create eyes, nose lips etc. using 2 pixel brush. Create 2 springy antenna and place on top of the head.

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此刻蒙版该层&填充黑色，然后白色笔刷画云的部门，你也许能透过此步操作看见很差劲的像素，快利用钤记工具盖上他们。

Now mask the layer and fill it with black. Then with a white brush draw over the clouds. As you can see my clouds get some really ugly pixels so I used the Clone Tool (S) to cover them up.

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此刻蒙版该层&填充黑色，然后白色笔刷画云的部门，你也许能透过此步操作看见很差劲的像素，快利用钤记工具盖上他们。

Now mask the layer and fill it with black. Then with a white brush draw over the clouds. As you can see my clouds get some really ugly pixels so I used the Clone Tool (S) to cover them up.

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