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Corona Für 3Ds Max FOKUS FILM & VFX 3D & AnimatiON INTERACTIVE DigitaL Art SCIENCE & EducatiON SERVICE Bilder: Render Legion/Octane Render Bilder: Beispiele Materialien (Quelle Corona Website) Corona für 3ds Max Die erste offizielle Version von Corona ist seit Februar dieses Jahres auf dem Markt. Zuvor ermöglichte eine fast 6 Jahre dauernde Alpha-Testphase die kostenfreie Nutzung der Render Engine, auf diese Weise band ein interessantes Produkt auch eine recht breite Palette an Usern an sich. Interessant vor allem, weil – entgegen der Ausrichtung vieler Render- Engine-Hersteller die Grafikpower für die Renderprozesse zu nutzen – Corona ausschließlich die CPU beaufschlagt. Und das mit großem Erfolg. von Rüdiger Mach rsprünglich als studentisches Projekt es auf der Corona Website (www.corona- Power ist kein maßgeblicher Kostenfaktor gestartet hat sich Corona in den letz- renderer.com). mehr und gerade bei der Verwendung von Uten Jahren erfolgreich entwickelt. Renderknechten spielt somit die Grafikkarte Wir haben uns die aktuelle Version Corona Technologie, GI, Render Engines keine Rolle. Hohe CPU-Leistung und RAM 1.2 für 3ds Max angeschaut und eine eige- sind alles was man braucht. Corona setzt auf ne Meinung gebildet. Meine Testplattform: Corona setzt zu 100 Prozent auf die Nutzung der von Intel entwickelten Embree Techno- Dell Precision M6800, Windows 7 Pro und der CPU und hat einen flotten und einfach logie (embree.github.io) auf und unterstützt 3ds Max 2016. Viele zusätzlichen Informati- zu bedienenden Renderer geschaffen, dem sowohl „biased“ als auch „unbiased rende- onen und Details zu allen Neuerungen gibt die verwendete Grafikkarte egal ist. CPU- ring“. O2 WWW.digitaLPRODUCTION.COM AUSGABE O7:2O15 CORONA | 3DS MAX Zur Erinnerung: beziehungsweise Szenen in geschlos- 3ds Max Plug-in on Corona senen Umgebungen zu berechnen. i Biased Rendering: In einem verein- Hersteller: Render Legion fachten Beleuchtungsmodell wird die Selbstverständlich kann der zweite Solver Plattform: 3ds Max/Design, Windows Lichtverteilung in einer Szene ermittelt. auch komplett ignoriert werden, was ge- Preise: FairSaaS-Mietmodell: Die verwendeten Methoden sind Annä- rade bei Außenszenen für eine ordentliche monatliche Rate ab 24,99 Euro; herungen an eine „echte“ Lichtverteilung Beschleunigung der Renderzeiten sorgt. Boxmodell: 449,OO Euro; und dienen der Geschwindigkeitsoptimie- Für die Berechnung der Szenen stehen drei Subscription: 99,OO Euro/Jahr, optional rung. Beispiele sind „Light Caching“ oder verschiedene Methoden zur Verfügung: Weitere Preise und Lizenzmodelle finden sich auf „Irridiance Map“. Im Vordergrund steht der Website: www.corona-renderer.com die Performance. Bekannte Renderer i Progressive (Standard): Hier erfolgt sind Mental Ray oder V-Ray. die Berechnung, ähnlich wie bei Iray, durch Verfeinerung der Bildqualität mit den geübten Max-Anwender bedarf es nur i Unbiased Rendering: Hier liegt ein phy- jedem Durchgang (Renderpass). Die An- einer kurzen Auseinandersetzung mit den sikalisch korrektes Beleuchtungsmodell zahl der zu berechnenden Renderpasses Renderer, damit er sich zurechtfindet. zugrunde und die Berechnung kommt der kann manuell festgelegt werden. Realität ziemlich nahe. Im Vordergrund i Bucket: Die Bucket Engine arbeitet wie Workflow – Migration stehen korrekte Ausleuchtung und phy- die Progressive Engine und wird von sikalisch korrekte Wiedergabe. Bekannte Corona für den Einsatz in Szenen mit Wie fast alle Renderer bevorzugt Corona die Renderer sind Arnold oder Maxwell. großen einheitlichen Flächen empfohlen. eigenen Materialien und Lichtquellen für op- i BiDir/VCM: eine experimentelle Engine, timale Ergebnisse. Werden Standard-Materi- Mit Path Tracing und UHD Cache bietet die den Fokus auf Berechnungen von alien und Lichtquellen problemlos akzeptiert, Corona verschiedene Möglichkeiten, Global Caustic-Effekten legt. so sind für Materialien und Shader fremder Illumination zu berechnen. Render Engines ein paar Extra-Maßnahmen Interface und Bedienung erforderlich. Dies gilt übrigens auch für Men- i Path Tracing: „unbiased“ Methode, um tal-Ray-Materialien.Ein Max-Script sorgt für das Endergebnis mittels von der Kamera Corona kann, wie alle Render Engines in 3ds die Konvertierung aller Fremdmaterialien und ausgehender Lichtverfolgung zu berech- Max im Render Setup (F10), unter Renderer Lichtquellen in eine Corona-kompatible Ver- nen – Einstellungen sind nicht vonnöten aktiviert werden. Nach erfolgter Auswahl sion. Das Script funktioniert einwandfrei für und Corona liefert auf Knopfdruck ein bietet Corona eine übersichtliche Auswahl die meisten in Max verwendeten Renderer, überzeugendes Ergebnis. Path Tracing an Rendereinstellungen, die sich „fast“ von doch empfiehlt sich eine manuelle Überprü- ist der voreingestellte Primary Solver selbst erklären. Path Tracing und UHD Cache fung der durchgeführten Änderungen. Das und ist die Option der Wahl für große sind als Voreinstellungen aktiv und liefern Script findet sich nach der Installation unter: Außenszenen. auf Knopfdruck gute Ergebnisse. Corona C:\Program Files\Autodesk\3ds Max 2016\ bringt von Haus aus einen eigenen VFB (Vi- scripts\CoronaRenderer i UHD Cache: „biased Cache“ Variante ver- deo Frame Buffer – Rendervoransicht) mit einfacht die Ergebnisse der Path Tracing und ermöglicht bereits im laufenden Ren- In 3ds Max kann der Konverter über die rech- Methode und liefert ähnlich hochwertige derprozess Änderungen an verschiedenen te Maustaste im Quadmenü gestartet wer- Ergebnisse wie Path Tracing. UHD Cache Bildeinstellungen wie Belichtung oder Farb- den. Aber Achtung: Einmal in eine Corona- steht als Secondary Solver für die Verein- temperatur. Zusätzlich findet man im Ma- kompatible Version umgewandelt führt kein fachung der Berechnung zur Verfügung. terialeditor die Corona eigenen Materialien Weg zurück. Wer also mit dem Gedanken UHD Cache ist optimal um mit Path und Maps. Beeindruckend an Corona ist spielt ggf. mit einer anderen Render Engine Tracing als Primary Solver Innenszenen die Übersichtlichkeit aller Parameter. Für zu arbeiten, sollte dies berücksichtigen. Hier Screenshots Rendermenü und Corona-Materialien O3 FOKUS FILM & VFX 3D & AnimatiON INTERACTIVE DigitaL Art SCIENCE & EducatiON SERVICE Materialdarstellung im Materialeditor mit Voransicht, die durch die Render Engine erzeugt wird Interactive Rendering mit Render Preview empfiehlt sich – je nach Art des Projekts – Corona Sun sind selbsterklärend. Nutzt man hat sich in kurzer Zeit eine breite Vielzahl an die Erstellung einer „Basis-Datei“ mit Stan- eine bestehende Szene und konvertiert die- externen Anbietern für vordefinierte Materi- dardmaterialien, um zumindest die Option se mittels des zuvor erwähnten Scripts erüb- albibliotheken etabliert. Eine Übersicht gibt für die Nutzung einer alternativen Render rigt sich die Erstellung neuer Lichter. Scha- es ebenfalls auf der Corona-Website. Engine zu ermöglichen. Eine weitere Mög- de ist, dass die Corona-Lichtquellen nicht lichkeit für die Praxis ist die Erstellung einer über den Max-eigenen LightLister verwaltet Die Corona-Materialien Materialbibliothek mit gleichnamigen Mate- werden können. Der freie LightLister für Co- in der Übersicht: rialien wie die in Corona verwendeten. Ma- rona Render von „ecximer“ bietet Abhilfe: terialbibliotheken lassen sich in Max schnell corona-lightlister.com. i CoronaMtl: auswechseln. Erfreulich ist die Einbindung Das Standardmaterial ist für nahezu alle von kleinen Tooltipps, die an jedem rele- Materialien und Maps Anforderungen gerüstet. Der Shader un- vanten Menüpunkt von Corona eine ausführ- terstützt auch Translucency und Volume liche Hilfestellung anbieten. Corona liefert eine Palette an Materialien, Scattering und lässt sich einfach und die für nahezu alle Belange ausreichen. unkompliziert nach Bedarf konfigurieren. Lichtquellen Wer lieber vordefinierte Materialien nutzen möchte, ohne selbst Hand anzulegen, findet i CoronaLightMtl: Corona nutzt bevorzugt seine eigenen Licht- eine große Auswahl auf der Corona-Web- Im Gegensatz zur Möglichkeit einem quellen. Die zwei Lichtypen CoronaLight und site: corona-renderer.com/resources. Auch normalen Corona Material eine Self O4 WWW.digitaLPRODUCTION.COM AUSGABE O7:2O15 CORONA | 3DS MAX Illumination zu verpassen, wirkt das Light i CoronaShadowCatcherMtl: Interactive Rendering Material wie eine echte Lichtquelle. Ob- Das ShadowCatcher Material entspricht jekte, die mit diesem Material versehen dem Matte/Shadow Material von 3ds Die in 3ds Max integrierte interaktive wurden, leuchten die Szene aus und Max. Ob mit oder ohne Alpha-Kanal- Renderoption via Active Shade zählt nicht sorgen auch für Schattenwurf. Unterstützung dient es der Einbindung unbedingt zu den komfortabelsten. Der von Szenenobjekten in vorhandene Ressourcenverbrauch kann frustrieren und i CoronaPortalMtl: Backplates. Abstürze des Programms sind nicht selten. Statt eigenen Lichtquellen für die Corona bietet interaktives Rendering über Schnittstelle von draußen nach drinnen – i CoronaVolumeMtl: die Render Engine und hier gibt es nur eine wie beispielsweise Mental Ray Sky Portal Etwas irritierend für den Max-Anwender, mögliche Beschreibung: Es funktioniert und – setzt Corona auf die Verwendung eines der es gewohnt ist, Atmosphäreneffekte macht Spaß! Interaktives Rendering starten, eigenen Materials. Geschlossene Räume über „Environment“ und Atmosphären- Path Tracing für den ersten und zweiten Sol- mit Fenstern und vorhandener Außen- helfer zuzuweisen, erzeugt das Volume ver aktivieren, und die Aktualisierung auch beleuchtung können damit
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