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Tag: 算圖男(RenderMan)

Renderman Multi-threading

作者:Mao on 八月.06, 2009 Posted in RSS |

最近蠻困惑的,Pixar說他們現在的threading很多bug已經修掉了(prman13.5),所以可以放心的使用,可以從multi-processor改到multi-threading的方式,可是這一個案子用起來有時候會怪怪的,最近查了一...

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討厭的maya nurbs uv與renderman st

作者:Mao on 六月.23, 2008 Posted in RSS |

不知道為什麼,maya nurbs的ub順序就是跟renderman的ST方向不一致,如果UV沒有rotate,那麼直接將ST的angle設-90度或者用mayaUV這個node,不過如果uv有rotate就很煩人了。以下是不負責任的maya uv轉換ST程...

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利用Ribbox來製作pass

作者:Mao on 六月.18, 2008 Posted in RSS |

在動畫製作中,常常需要給合成部門(comp)各種不同的pass,假設我們將畫面分成兩層:前景(fg)與後景(bg),也許comp需要1.前景為matte,需要產生影子或反射在背景上。2.前景不運算,但是需要產...

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Render with bleed

作者:Mao on 六月.13, 2008 Posted in RSS |

大部分的時候,算出來的圖都要經過comp做一些defocus的動作,這時候出血(bleed)就很重要了,出血一詞是印刷的用語,意指印刷裝訂的底色,須比裁切線多出一點,這樣裁切時就不用怕邊邊是...

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善用filter

作者:Mao on 六月.12, 2008 Posted in RSS |

因為很懶,所以很久沒有新內容了,最近因為算的東西用了許多的displacement,而且displacement bound都開的蠻大的,造成了運算的時間還蠻久的,可是mtor預設是算shadow map也會算Displacement,所以就...

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UberLight parameter mapping

作者:Mao on 六月.28, 2007 Posted in RSS |

width -> tan($CONEANGLE)height -> tan($CONEANGLE)
將ShapeLightVolume函式中呼叫clipSuperellipse的參數由clipSuperellipse(…,width, height,width+wedge, height+hedge, roundness); 改成clipSuperellipse(…,width-wedge, height-hedg...

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How to determine shader working in slim icon preview or normal prman render

作者:Mao on 六月.28, 2007 Posted in RSS |

通常Shader如果在rat slim palette中做一些事情會讓整個rat crash掉,例如bake3d這個function,或者是需要在preview的時候做一些取巧的小步驟,這時候就需要判斷現在是rat的internal render還是一般的prman r...

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One Light with multi-shadow

作者:Mao on 四月.26, 2007 Posted in RSS |

有時候需要燈光是從遠方照在空曠的地方上,而需要產生影子的物體距離很遠,shadow camera必須要將這些物體都涵蓋進去,儘管已經調了angle of view物體在shadow map佔的大小還是很小,這時候就...

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Baking is easy

作者:Mao on 三月.20, 2007 Posted in RSS |

原本我要將已經算出來的occlusion或shading color bake成2D的texture都需要自己兜一堆SLBOX跟RIBBOX,可是剛剛發現了Bakeable這個好用的shader。—-It’s a trouble for baking calculated occlusion color or some shad...

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Pointbased Occulsion

作者:Mao on 三月.19, 2007 Posted in RSS |

在Renderman的rsl function列表中,occlusion函式並沒有列出pointbased這個參數,但是他確是使用pointcloud based occlusion不可或缺的設定。————–In Rendernman rsl function document,you can’t...

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