HDRI Կ Maya Ȱ!
. ̼
Nthma Production Team
Render Part TD
Nthma Production Team (http://www.nthma.com)
Ʈ : Ʃ丮 Alias Maya 6.0 HDRShop 1.03 Ͽ Ʈ Ǿ.
ϸ鼭
: Maya 6.0 ǥǸ鼭 κп κ Ʈ ϵ δ. ߿ ̹ ڰ ϰ κ RenderGlobal κп Image Based Lighting ( MentalRay RenderGlobal̴) ̶ žǾ. ƽ 6.0 ̸ HDR ϱ ߰ ߿ HDR 6.0 Ѵ. ̷ ɵ žǸ HDR̶ , Image Based Lighting ̶° ñ . 켱 Image Based Lighting̶ ״ Image Ʈ Ѵٴ ǹ̰ ɰ . ٸ ̷ Image Based Lighting HDRI 踦 ӻ ִ ˾ƺ . ̹ Ұ Workflow 캸 .
1) ũҺ ̹ Կ
2) HDRShop ̿ LightProbe Mirror HDR Image
3) LightGen Plugin HDRShop Image Based Lighting Ʈ ҽ
4) LightControl.mel ̿ Maya Ʈ
5) ռ
5 Workflow ۾ . ÷ ⺻ Ǹ Global Illumination ǥ ֱ ̸, ̰Ϳ ȮϿ MentalRay ̿ Image Based Lighting ؼ Ұ .
Ʈ : ۾ Vincent Lin Cheap HDRI Ʃ丮 Paul Debevec Ȩ, HDRShop Ŵ м ˷д.
Section1 : HDRI ΰ?
i) HDRI (HIgh Dynamic Ranged Image)
: HDRI ?
ڰ ۳ MentalRay ϸ鼭 Ұߴ ٽ . 츮 Ȱϰ ϴ Ϳ ǹ̵ Ѵٸ ܼ 迡 Ұ ʹ. ߺ ̷ ۿ ° Ѿ .
High Dynamic Range Image ڷ ״ ̹ ǥ ٴ ̴. 츮 äδ 256 ܰ ǥؼ 160 ̹ ϼϰ ִ. 㳪 ֱٿ ǥ Ȯ ؼ ̻ 䱸ϴ ۾ ð ִ. ƴ϶ Ҽ ϰ ǥν û Ǵ ̴.
HDRI ̷ Ȱ ϳ ȴ. HDRI ̹ , ̳ Ǻ ϴ ̹ ջ õ ä Ѵ. HDRI ̴. ǻ ƼƮ α ڵ 3D μ HDRI ô״. κ HDRI Non-Clamped ˿ Ǿ ٸ ǥ̶ Ѵ. ( Real Pixel Format ̶ Ѵ.) Non-Clamped 뷫 5 ƽ 1,0 ־.
̹ ߿ Բ ȴٴ ̴. Ϲ Ʈʵ Ұ 0~255 ̿ RGBA Ǿ . äο ؼ ̴. RGBAμ ̹ Ʈ ¹ ſ Ǹϰ δ. 㳪 Ż̿ ø̼ǿ ̿ ̹ Ϸ , Ǹ RGBA δ ͵ սǵ ִ. RGBA ̹ ߰ ߿ ߿ ϳ ʼ ִ ̴. ̿ ϴ ̹ 3D ڿμ ʿ Ѵ. μ ̹ ؽĵ ġؼ ϴ Image Based Lighting ̶ Ѵ. RGBA ̹ ſ ̰ ڿμ ſ ǰ ϰ ȴ.
RGBA ̹ Ͼ ȼ Ͼ , Ͼ , Ͼ ¾籤, 500Ʈ Ͼ , Ͼ ߷ε ǥ ִ. HDR-Image ϴ RGBA Ҹ ϴ , ߰ ȼ鿡 Բ ȴٴ ̴. ̰ ϳ ̹ Ͼ ȼ ٸ Ͼ ʼ ϰ ִٴ ̴. RGBA-E ̹ ν, ý ȼ ˰Եȴ. ȼ ϰ ȴ. 300 ̹ ȼ 255 Ͼ Ǵ ̴.
̷ E RGBA JPEG ̹ Image Based Lighting Ȱ E HDR Image Ȱ Image Based Lighting ظ ̸ Ǵ ̴.
۾ .
ũҺ ̹ Կϱ
: ̹ ٽѹ . DIY HDRI ̴ DIY Ѷ ߴ "ڱ " ǻ ǰ 缭 ؼ ٴ ˷ . ״ ̹ 츮 츮 ϴ ҿ ð 츮 ϴ ̹ 츮 ΰ HDRImage Ȱ ̴. ͳ ؼ ξ ǰ HDR ҽ ϴ ƴϴ. 츮 Ը ´ Ȯ (Ư ݻ ) ټ 츮 ϴ ̹ ƴ ۿ . Ƿ 츮 ϴ յǴ ̹ ΰ ϴ ̴. ̷ ϰ ߿ ϳ Ƹ ִ ī . ī ϰ ν ̷ ۹ĵ ̴. к ڸ ǰ Ϻ HDR ҽ . 츮 ϴ յ ůǰ ̾Ƴ ֵ ּ غ.
i) Կ غ
: Կ ʿ غ ˾ƺ. 켱 ī ־ ϰ, ԿǸ ݻų ִ ݻ籸, ݻ籸 ÷ ִ ĵ尡 ־ Ѵ. ̷ غ ȴٸ غ ģ ̴. ڰ غ ù ˾ .
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: Կ Olympus Camedia E-20 Կߴ.
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: ũҺ ٷ ߴ. 8 ¥ ߴ. ĵ ħ 100¥ CD ̽ ϰ Ÿ Ͽ ԿϿ. κп Vincent Lin Ʃ丮 ߴ. ũҺ ڰ Ǽ ־. ũҺ ü . ó ġ κ ִ HDR ̹ ÿ ݻǾ κп Ǵ Ǿ. ִٸ ü ũҺ ϴ ̴.
ii) Կϱ
: Կÿ ̸ ؾ ִ. 켱 ϴ Ȯ ϴ . ƹ Կ , ð, Ȯ Ƽ ȲϿ Կ غ. Ǿٸ Կ µ Կÿ ϸ ȴ.
1) ڽ ī mm Ȯ . 35mm 50mm Կϰ Ǵµ ߿ ռϰ ߿ϹǷ ڽ Կ Ȯ д.
2) Կ Կ ϰ ȴ. Ʒ ̹ Vincent Lin ̴̹. ð ǥǾ ִ.
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: ٿ ī A B ִ ݻ ݻü ȯ ݻ ִ ̴. ⼭ ī A B ġ ԿϿ Ѵٴ ̰ κ Ÿ ƾѴ. Top View Ͱ ġ Կϸȴ. ġ Կ ؾѴ. ̰ HDR Image ٽ̶ ִ. Side View ٿ ġ ߽ ġ ̿ ġؾ Ѵٴ ̴. Ʒ .
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: ī δ ԵǸ ߾ ִ κ ؼ ִ. ؼ ī ̿ ݻ籸 ߽ɳ̸ ġ Ų Կϸ ȴ. ̰ ī A B ϰ Ǹ Ȱϴ ġ ٸ ̴. Կÿ ݵ Ⱚ 鼭 ԿѴ. AB ߿ AB Կ ̹ ġ ǹǷ Ⱚ ; Ѵ. Ƿ ǿ ״ , dz Ⱚ 鼭 Կ غƾ Ѵ. HDRShop ִ ִ ȿ̴.
: Ʒ ̹ ڰ Կ ī AB ̹ JPEG ̴̹.
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ŬϽø ũ Ǽ ֽϴ.
: Ʒ ̹ ռ Ǵ ̴̹. ݻ ũҺ Կϰ ռ ǻ Կ ʴ . ٽ ʴ´.
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: Կ κ Կ ̹߿ Ѵ. ڴ ̹ Ʒ ߴ.
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: ̴̹. ̹ 2568 X 1916 ػ TIF ̹ ԿǾ. HDR ̹ ϴ ī ҳ TIF High Dynamic Range Ƿ ̷ Ͽ. ⼭ ڰ ī ɰ ػ , ϴ ˿ پϰ ִ. JPEG ϴٴ ̴. JPEG Image Based Lighting ϰ ִ. ǰ ִٴ ̴. 256 ܰ ȼ Ѱ RGB JPEG ŭ Ѱ谡 ִ ̴.
: ǻ տ ɾ ۾ غ .
Section2 : HDRShop ̿ LightProbe Mirror HDR Image
i) HDRShop
: HDRShop ̶?
HDRShop High-Dynamic Range images óϰ ֵ ε α̸, ̹ ִ interactive α̴.
: غ ̹ HDR Image . ΰ̴. ù ° Կ ̹ ܰκ Unwrap ϰ Ǹ ܰ κ ص ȴ. ̰ 츮 ϴ ̹ ġ ް ߸ Ǵ ̴. ° ī Կϴ ٴ ̴. ǵ ī Ѵٸ 츮 ϴ ũҺ ݻ̰, ī Կڴ ݻ翡 ʰ ϴ DZ տ ΰ ݵ ذؾ߸ ϴ ̴. 켱 HDRShop . HDRShop 뵵 ƴ϶
̰
ٿε ִ.
: Ʒ HDRShop Interface̴.
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: ̹ ̿Ͽ ذϸ鼭 ϳ Mirror Ball HDR Image
1) ̹ Open .
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2) Camera A ̹ Select->Draw Option->Dotted Line Circle üũϰ ̹ ܰ .
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3) Image->Crop ɼ ̿ õ κ ©.
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: Camera B ̹ Crop ѵ ̹ Image A, B ٸ ̸ ؼ ٽ ҷ.
4) ̹ ġ ۾ ؾѴ. ⼭ ⺻ ƾ ִ. ̹ ġ ؼ ̹ Ǵ ּ ƾ Ѵٴ ̴. ڴ ǵ ī ī ξ ֺ κ Ҵ. Ʒ ̹ Ȯ .
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ŬϽø ũ Ǽ ֽϴ.
5) Point ߴٸ ġ ġ Ȯ ˾ƾ Ѵ. Window->Point Editor ̿ Point ˾ƺ.
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ŬϽø ũ Ǽ ֽϴ.
: Point 0 Point1 ߴ. Ctrl Ű ϸ Ʈ ִ. HDRShop Ʈ ϹǷ XY .
: Image B ؼ Ʈ . Point Editor Display Show Points üũ Ʈ Ȱȭ ȴ.
6) Ʈ ̿ ̹ ľ Ѵ. ⼭ ̹ Unwrap Rotate ʿϴ. ǰ ʿϴ Ȯϰ ؾѴ.
켱 ̹ ϳ ȸ Ѿ Ѵ. 츮 Image A ȸ Image B ؼ ȸ ̴. 츮 ϴ LightProbe Format ȯ ̴.
Image B Image->Panorama->Panoramic Transpormation Ѵ. Ѵ.
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ŬϽø ũ Ǽ ֽϴ.
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: ImageB.hdr Warped ̹ Ǿ. Supersampling ⺻ 1̴ Ƽ Ѵٸ ġ ø ȴ.
7) Image A ȸŰ鼭 LightProbe Format .
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ŬϽø ũ Ǽ ֽϴ.
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: Image A 3D Rotation Ű Match Point Setting ռ ξ ϸ ̹ ȴ.
8) ̹ ľ Ѵ. ؼ Image A 0 Image B 1 ν ߰ ũ ̿ؾ Ѵ. Ƿ ̹ 伥 HDRShop ϴ BMP TIFF Ѵ.
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9) ũ ̿ ̹ ġ LightProbe Format ̹ .
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ŬϽø ũ Ǽ ֽϴ.
: Souce Image ̹ ϰ Operation A*C+B(1-C) OK .
: Ʒ LightProbe Format HDR Image ̴.
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: 츮 ϴ HDR ̹ Դ. ó ߴ ܰ ī Կ Ǿ. Ѱ ó ߵ ũҺ . ũҺ ϴ ħΰ ݻǾ ̹ HDR Image ȴ. ٽѹ Ϻ ü ũҺ ̹ µ ξ ̴.
: ̹ Maya Ȱ ִ° ˾ƺ.
Section3 : HDRShop + LightGen Plugin ̿ Light Source
i) LightGen Plugin
: LightGen ̶?
LightGen Paul Debevec Ͽ Jonathan Cohen ÷ ̴. ̰ LightProbe ̹ ̿Ͽ Directional Light ҽ µ, ÷ κ Global Illumination ʴ ִٴ ̴. 켱 LightGen HDRShop ÷̴. ϴ ˾ƺ.
1) LightGen ϱ غ
: LightGen
̰
ٿε ִ. ġ HDRShop ٿ ε HDRShop.exe ܵ ϳ ް Ǵµ ⼭ HDRShop̶ ȿ HDRShop.exe ־. ȿ plugins ȿ LightGen ÷ ־ְ HDRShop ϸ ȴ.
: Ʒ LightGen Plugin HDRShopȿ Ե ̴.
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ŬϽø ũ Ǽ ֽϴ.
: lightgen_plugin ʴ´ٸ Rescan Directory ٽ εϸ ȴ.
2) 켱 LightProbe ̹ latitude-longitude format ٲپ ־ Ѵ.
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: 츮 HDR Image Latitude/Longitude Format ȯϸ鼭 ػ 128X64 . ̻ ػ ǹ̰ , ð ɸ ̴. Supersampling 1 ص .
3) LightGen ؼ 츮 ϴ Light Sources .
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: ó 翡 Ʈ ̸ ġ ־ Ѵ. ⼭ ݵ ̸ .mel . ڰ ŸԿ MEL ؼ ̸ ְ ó ϴ ʾҴ. ݵ .mel Ȯ . 迡 File Type MEL . Ӵٿ 캸 Text, Arnold, Houdini Ѵ ִ. 츮 ߷ ۾ ̹Ƿ MEL غ. ɼ Ʈ Ʈ ʿ ݰ ϴ ε, ϴ ⺻ .
: Scale total light output üũ ʰ Ǹ Ʈ Ⱑ ʹ ִ. 쵵 ֱ ͵ .
4) ̴.
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ŬϽø ũ Ǽ ֽϴ.
: ھȿ ִ ̴. ٿ 츮 ɼǿ 20 Ʈ ҽ . Success â ùٸ Ǿٴ Ͱ װͿ ִ â̴. ߿ ռ .
Section4 : LightControl.mel Script ̿ Maya ۾
i) LightControl.mel Script
: LightControl LightGen Ʈ ҽ Ȱϰ ϴ ũƮ̴.
1) LightControl.mel ϱ غ
: LightControl.mel
̰
ٿε ִ.
: ġ "HdrShopLightControl.mel" "C:Documents and SettingsAdministratorMy Documentsmaya6.0scripts" ȴ. 4.5 Ǿ Maya 6.0 Ȱ ִ.
: Ʒ Maya Կ ̹ 3D ռų Ʈ ̴̹.
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ŬϽø ũ Ǽ ֽϴ.
: ī Focal Length Կ 35mm Ѵ. ⼭ κ ٴ UseBackground Shader Ѵ. Ȯϰ ռ ؼ Ʈ Perspective Ͽ Ȯ ϳ, κб ϸ ʹ Ͽ κ ϱ Ѵ.
2) Ʈ â̳, Script Editor â HdrShopLightControl .
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ŬϽø ũ Ǽ ֽϴ.
: ٿ HDRLightControl ɼâ 鼭 츮 ߴ Directional Light Source ܳ. Dome Light ¸ ϰ ִ ϴ.
: Outliner â 츮 ̸_Control̶ Ʈ ִ ִ.
3) LightControl ɼ ϱ
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ŬϽø ũ Ǽ ֽϴ.
: ̹ Directional Light ϳ ؼ Attribute Editor ̴. ̹ ̴. Color Ǫ ִ. Color Ʈ ٸ Ǿ ִ. ǹϴ 츮 ó ̹ ҽ κ Ʈ ״ ͼ ɼ (Search Radius)ŭ ̴. ᱹ HDR Imageκ Ϻϰ Ʈ ̻ ° ̴.
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: HDRLightControl.mel ϸ 츮 MEL ġ εϸ HDR Light Set MEL ̸ ҷ ̴. ʱⰪ 0̴. Shadow κ 츮 Maya κ̹Ƿ ϰڴ. ó Dimmerε ̰ Light Set ü ⸦ Ѵ. Light Hue / Saturation / Val ִµ 鼳 ° ȴ. ⼭ Tip ̶ Ѵٸ IPR ̿ ġ ϸ鼭 ǽð ͵ ̴.
: . HDRLightControl ̿Ͽ Global Illumination ϴ ̵ ϴ ִ. MentalRay ȯϿ ϴ ſ ̴.
: Ʒ ̹ Maya 6.0 MentalRay Ӱ ž Image Based Lighting ɼ̴. ɼ ϸ 츮 LightProbe Format ̹ ִ. ̰Ϳ ִ ϴ. ٴڸ UseBackground Shader Maya 6.0 Ż̴ UseBackground Shader ʴ´. ٰ ؼ ƴϴ. ڸ κи ʿϹǷ Ʈ ˰ ϰ ڸ Maya Software ̰ų, Ż̿ Pass Render и ̾Ƽ ϸ ȴ.
: ̷ ٹ ִ. ó Ǿ , ƴϸ ü ִ ݵ ó ۽ÿ ؾ Ѵٴ ̴.
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ŬϽø ũ Ǽ ֽϴ.
: ̹ Image Based Lighting ɼ̴.
: ռ ̴.
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ġ鼭
: Կ ռ Ҵ. ֵ 츮 ó 츮 ҽ Կؼ µ Ͽ. Technology ϸ Ҽ ͵ ϰ Ǵϵ . ϴ ⺻ Ǿ ʴٸ ѳ 忡 Ұ ̴. ο Ʈ ǰ Ѹ ưư 鸮 ʴ ̴. ̹ Ұ ߿ ⺻ ϴ ͵ Ҵ. غϸ ְ غ . е鵵 ſ ٶ. Do It Yourself!
Reference
Vincent Lin Cheap HDRI Ʃ丮
Paul Debevec HDRI Ȩ
HDRShop Ȩ
LightGen / Light Control plugin Ȩ
Maya 6.0 Help File
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. ̼
Nthma Production Team
Render Part TD
Nthma Production Team (http://www.nthma.com)
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