version 5.0 of the Arnold core rendering library and associated plugins for the main DCC tools. In addition, Autodesk today announced that 3ds Max 2018 ships with Arnold 5, replacing mental ray. Building on Arnold’s leadership in production ray-tracing, Arnold 5 represents an evolution in rendering for artists everywhere. Not just a feature release, Arnold 5 also represents a significant transition to a new architecture, paving the way for major developments to come. With a significant update to the Arnold core, faster rendering, new feature additions, enhancements to existing workflows and exciting new capabilities, Arnold 5 will help artists create more stunning imagery than ever.

“We are excited to make Arnold 5 available to artists worldwide,” said Solid Angle founder Marcos Fajardo. “With more than 500 development tickets completed, it has been a true labor of love as the team has really pushed to optimize Arnold and prepare the platform for future development.”

Arnold 5 is available now as a standalone renderer, as well as a plugin for Maya (MtoA), 3ds Max (MAXtoA), Cinema4D (C4DtoA), Katana (KtoA), and soon Houdini (HtoA) and Softimage (SItoA). Individual licenses can be purchased from Solid Angle’s web store. Free trials are also available for download.

Simpler C++ API

At the core of Arnold lies a powerful C++ application programming interface (or API) upon which users can build custom tools, whether they are shaders, geometry procedurals, or translator plugins for the main DCC tools. In Arnold 5, this API has been cleaned of legacy features, refactored, extended and simplified so that writing new Arnold-powered applications is easier than ever, while resulting in faster, more consistent code. Existing applications will need to be recompiled to take these changes into account, although for the most part these are easy changes, described in detail in the technical release notes and accompanying API docs. New APIs have been added for introspecting procedural geometry nodes, creating custom color manager nodes, and preprocessing texture maps into .tx files.

In addition, Arnold 5 introduces a decoupled shading API, and associated BSDF API, that relies on closures. Internally, all of the Arnold built-in shaders rely on closures now. Closures are the groundwork that makes it possible for shaders to benefit from future improvements in global illumination algorithms (such as bidirectional techniques) without having to modify the shaders themselves.

Image courtesy of Dade Orgeron


Many subsystems in Arnold 5 have been optimized, resulting in significant speedups during both render start-up and ray-trace time. Large OpenVDB volume caches in particular can load up to 2x faster, specially on highly-threaded machines. Preprocessing .tx textures is now multi-threaded and can be 10x faster. Both the implicit surface and curves geometric primitives are faster to ray-trace. Indoor scenes with multiple GI bounces, as well as objects with high transmission depth, can render up to 2x faster. Opacity-mapped transparent surfaces, such as tree leaves, can render up to 20% faster, specially in machines with many threads. In many cases, images render both faster and with less noise.

Kingsglaive: FFXV used an early development version of the standard_volume shader. Image courtesy of Digic Pictures.

Better samplers

Arnold 5 includes several sampling optimizations. New two-dimensional dithered sampling, which improves the visual distribution of noise at lower sample rates, significantly improves sampling results with soft shadows, indirect illumination and depth of field. Direct illumination sampling has been redesigned for quad, disk, and cylinder lights, helping reduce noise for both surface and volumetric lighting with these popular light types. Indirect illumination has been improved and can result in significant speedups for indoor scenes. Taken together, these improvements will allow Arnold users to get better results faster, while still enjoying Arnold’s ability to tackle the most complex production rendering challenges.

Old vs new samplers with quad and disk lights, shown at 1 sample/pixel

Easier to use

One of the main goals of Arnold 5 is ease of use. While the previous Arnold architecture has been tremendously successful for over five years, common workflows were identified that resulted in wasted time and effort. Arnold 5 simplifies some of these workflows. Installation and deployment is easier, particularly in the cloud, with fewer moving parts thanks to built-in libraries such as OpenVDB 4, as well as an extensive set of new built-in shaders that eliminates the need for 3rd-party shader libraries. Similarly, an advanced VR camera node comes with Arnold out of the box. Procedural geometry and volume plugins no longer need to provide or guess bounding boxes, and namespaces make it easier to assemble complex scenes that reuse assets without shader naming conflicts. Mirror reflection and glossy reflection are combined into a single “specular” ray type. Image-based lighting is easier to set up thanks to new built-in visibility flags in the skydome light, which is now automatically visible in camera, reflections and refraction. Maintaining a linear workflow is easier than ever thanks to a new color space manager that replaces clunky gamma settings. Hair UVs are easier to specify and use. Internal cleanups made it possible to remove several obscure render options as well as node attributes, which resulted in an even simpler user interface presented to the artists. Many other little corners of the renderer have been sharpened and simplified for a more satisfying out-of-the-box experience.

Decreasing melanin content in the new standard_hair shader. Model courtesy of Zeno Pelgrims

New shaders

Arnold 5 ships with several new built-in shaders. These shaders are physically accurate and will allow artists to push the boundaries of realism with their renders:

Standard Surface

The new Standard Surface shader is an energy-conserving, physically-based “uber” shader capable of producing many types of materials and looks. It includes a diffuse layer, a specular layer with complex Fresnel for metals, rough specular transmission for glass, subsurface scattering for skin, single scattering for water and ice, a secondary specular coat, and light emission. Compatible with the Disney principled material (aka PBR shader), it makes it easy to transfer materials from other applications. The shader is very efficient, taking advantage of new GI sampling techniques for faster rendering, and also supports per-light AOVs. This shader makes the older “standard” shader deprecated.

Standard Hair

Standard Hair is a physically-based shader to render hair and fur, based on the d’Eon model for specular and Zinke model for diffuse. Realistic results can be obtained by setting a few simple parameters for the base color, roughness and index of refraction. Realistic tones for human hair can be easily achieved with controls for not one but two types of melanin. Unbiased, hair-to-hair multiple scattering is supported, and thanks to specialized sampling techniques is efficient enough to be used in production without resorting to dual scattering or other tricks. The older “hair” shader is now deprecated.

Standard Volume

The Standard Volume shader simplifies rendering of smoke, clouds, and explosions, without the need to create convoluted shading networks. The shader provides independent control of density, scattering color and transparency, in a way that is energy conserving by default. Fire can be rendered using blackbody emission driven by temperature. Each component can be controlled by a volume channel coming from the volume object. Optionally channels may be entirely procedurally driven and displacement can be used to add more detail to volumes.

Utility shaders

More than 80 optimized and powerful utility shaders, some of which were previously shipped with the MtoA/HtoA/C4DtoA plugins, are now built into the Arnold core rendering library. This greatly simplifies the sharing of assets across DCC apps and pipelines, as there is no need to worry about shader paths or out-of-date libraries. These shaders include mix, thin_film, blackbody, flakes, normal and vector mapping, triplanar, jitter, and curvature, as well as math building blocks like add, multiply, length, etc.

Skin shading using the new standard_surface shader. Image courtesy of Johan Rimér

Artistic smoke using the new standard_volume shader. Image courtesy of Lee Griggs

OSL support

With 5.0, shaders can now be written in both C++ and Open Shading Language, an advanced shading language for production GI renderers. OSL shaders placed in the shader search path are automatically registered as Arnold shader nodes, with their parameters converted to Arnold parameters. Once loaded, they can be inspected, instantiated and linked in exactly the same way as C++ shaders. OSL shaders can be used to implement anything from simple texture patterns to full materials using closures.

“Logan” digi-double using Arnold OSL shaders. Image courtesy of Image Engine

Light Path Expressions (LPEs)

Light Path Expressions are used to extract and write specific lighting components into separate AOVs. In addition to the existing mechanism for defining simple per-shader AOVs, individual shaders can now define AOVs for direct/indirect light and various layers with a regular expression syntax to define the subset of all scattering and emission events in the scene that should be written to each AOV. Built-in AOVs are available for the common cases, as are light group AOVs. LPEs provide power and flexibility for creating AOVs to meet the needs of production.

Improved color management

Arnold now natively supports both synColor and OCIO for better handling of input (textures) and output (rendered images) color transforms, and can be extended with custom color manager nodes. This makes it easier for the renderer to perform all its internal calculations correctly in a radiometrically linear space. The older gamma settings have been removed. In addition, wavelength-dependent spectral effects such as refractive dispersion, blackbody radiation and physical sky are now more accurate.


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The Zacks Analyst Blog Highlights: HEICO, Group 1 Automotive, Rent-A-Center, Repligen and Strategic Education

For Immediate Release Chicago, IL – June 4, 2019 – announces the list of stocks featured in the Analyst Blog. Every day the Zacks Equity Research analysts discuss the latest news and events impacting stocks and the financial markets. Stocks recently featured in the blog include: HEICO Corp. HEI, Group 1 Automotive Inc. GPI, Rent-A-Center Inc. RCII, Repligen Corp. RGEN and Strategic Education Inc. STRA. Here are highlights from Monday’s Analyst Blog: U.S. Heading for Largest Economic Expansion: 5 Top Stocks Finally, May's market mayhem is over. June 2019 promises to bring along fortunes as the United States is on the verge of completing the longest economic expansion. According to the National Bureau of Economic Research, the ongoing expansion started back in June 2009. The previous record of longest economic expansion was from March 1991 to March 2001. Fundamentals of the U.S. economy remain strong with no nearby sign of recession. Despite the stock market rout in May, a closer look at the U.S. economy has a different story to tell, with enough reasons for further rally on Wall Street. Stock Market Meltdown Likely Temporary President Donald Trump’s tariff wars against China and Mexico brought back volatility in Wall Street, which otherwise sailing through impressively in the first four months on 2019. In May, the three major stock indexes -- the Dow, S&P 500 and Nasdaq Composite -- plunged 6.7%, 6.6% and 7.9%. However, year-to-date, these indexes are still in the positive territory with gains of 6.4%, 9.8% and 12.3%, respectively. Notably, per Ben Carlson, director of institutional asset management at Ritholtz Wealth Management, a pullback of 5% or more in a month on the S&P 500 Index happened in 65 of the last 70 years. So, a sudden shock last month may well be the much-needed correction in stock markets. U.S. Economy Remains Strong For May 2019, the Conference Board's measure of consumer confidence index stands at 134.1 compared with 129.2 in April. May’s reading is near the 18-year high recorded in November 2018. This indicates that U.S. consumers are highly confident about future growth despite trade concerns. On May 3, the Department of Labor reported that the U.S. economy added 263,000 jobs in April. Year to date, job gains are impressive at 205,000 on an average per month. Unemployment fell to 3.6% compared with the consensus estimate of 3.8%. This marks the lowest level of unemployment since December 1969. The Philadelphia Fed manufacturing index came in at 16.6 in May, a massive gain from the reading of 8.5 in April. The index was the highest in four months in May. Notably, any reading above zero indicates improving conditions. The employment index grew to 18.2, the highest in five months. The prices index was at 17.5, the lowest in 17 months. Fed Maintains Dovish Stance The Federal Reserve has decided to keep the federal funds target rate unchanged in the range of 2.25-2.50% at least for the time being. The central bank also said that it will not downsize its $4 trillion balance sheet this year. Per the Fed, although U.S. economy is in solid footing, trade-related concerns may result in global economic slowdown which will reduce the growth rate of the U.S. economy. Moreover, core PCE inflation index – Fed’s favorite inflation gauge – increased 1.6% in April, well below the central bank’s target rate of 2%. Muted inflation and the likelihood of a reduction of U.S. economic growth may compel Fed to reduce interest rate, much to the delight of President Trump. The Trump administration is constantly blaming the central bank for its aggressive monetary stance as the major hindrance of economic growth. CTO at API Fortress, Simone Pezzano comments: Our Top Picks At this stage, it will be prudent to invest in stock with strong growth potential and a favorable Zacks Rank. We have narrowed down our search to five such stocks with a Growth Score of A and Zacks Rank #1 (Strong Buy). You can see the complete list of today’s Zacks #1 Rank stocks here. Each of these stocks has moved higher in the last three months and still has upside left. HEICO Corp. designs, manufactures, and sells aerospace, defense, and electronic related products and services in the United States and internationally. The company has expected earnings growth of 22.7% for the current year. The Zacks Consensus Estimate for the current year has improved by 3.7% over the last 30 days. The stock has surged 30.6% in the past three months. Story continues Group 1 Automotive Inc. is a leading operator in the automotive retailing industry. It has expanded to become the third largest dealership group in the United States. The company has expected earnings growth of 13.6% for the current year. The Zacks Consensus Estimate for the current year has improved by 4.5% over the last 30 days. The stock has surged 15.7% in the past three months. Rent-A-Center Inc. leases household durable goods to customers on a rent-to-own basis. It operates through four segments: Core U.S., Acceptance Now, Mexico and Franchising. The company has expected earnings growth of 100% for the current year. The Zacks Consensus Estimate for the current year has improved by 11% over the last 30 days. The stock has surged 24.6% in the past three months. Repligen Corp. develops, manufactures, and sells products used to enhance the interconnected phases of the biological drug manufacturing process in North America, Europe, APAC and internationally. The company has expected earnings growth of 28.8% for the current year. The Zacks Consensus Estimate for the current year has improved by 10.6% over the last 30 days. The stock has surged 17.4% in the past three months. Strategic Education Inc. provides a range of post-secondary education and non-degree programs in the United States. It operates through three segments: Strayer University, Capella University and Non-Degree Programs. The company has expected earnings growth of 36.2% for the current year. The Zacks Consensus Estimate for the current year has improved by 7.1% over the last 30 days. The stock has surged 23.8% in the past three months. Will you retire a millionaire? One out of every six people retires a multimillionaire. Get smart tips you can do today to become one of them in a new Special Report, “7 Things You Can Do Now to Retire a Multimillionaire.” Click to get it free >> Media Contact Zacks Investment Research 800-767-3771 ext. 9339 Past performance is no guarantee of future results. Inherent in any investment is the potential for loss. This material is being provided for informational purposes only and nothing herein constitutes investment, legal, accounting or tax advice, or a recommendation to buy, sell or hold a security. No recommendation or advice is being given as to whether any investment is suitable for a particular investor. It should not be assumed that any investments in securities, companies, sectors or markets identified and described were or will be profitable. All information is current as of the date of herein and is subject to change without notice. Any views or opinions expressed may not reflect those of the firm as a whole. Zacks Investment Research does not engage in investment banking, market making or asset management activities of any securities. These returns are from hypothetical portfolios consisting of stocks with Zacks Rank = 1 that were rebalanced monthly with zero transaction costs. These are not the returns of actual portfolios of stocks. The S&P 500 is an unmanaged index. Visit for information about the performance numbers displayed in this press release. Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Group 1 Automotive, Inc. (GPI) : Free Stock Analysis Report Heico Corporation (HEI) : Free Stock Analysis Report Rent-A-Center, Inc. (RCII) : Free Stock Analysis Report Repligen Corporation (RGEN) : Free Stock Analysis Report Strategic Education Inc. (STRA) : Free Stock Analysis Report To read this article on click here. Zacks Investment Research

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