1.将选中创建为一个名为chr15的object
create chr15,sele
 前
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 后
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2.设置颜色和透明度
整体透明度0.6：set sphere_transparency, 0.6
单独设置object的透明度0：set sphere_transparency,0,chr15
 设为灰色
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 整体透明度0.6
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 chr15透明度0
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3.设置球体大小
set sphere_scale,0.3
4.设置高光
set specular,number
该参数为全局设置
 set specular,0
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 set specular,0.5
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 set sphere_scale,1
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5.设置光照
set shininess,number
 set shininess,10
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 set shininess,55
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 set shininess,100
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