Forest Pack 9 Features Deep-Dive 2026: Render Farm Considerations for Archviz Studios

Introduction

Forest Pack 9 is the current production release of iToo Software's scattering plugin for 3ds Max, with FP9.0 shipping in September 2024, FP9.1 in February 2025, and FP9.3 in September 2025. Across that release window, iToo added a new climbing-plants plugin called ForestIvy, reworked the viewport for dense scatter scenes, expanded distribution-map support, and shipped formal compatibility with 3ds Max 2026, V-Ray 7, and the latest Corona and Arnold builds.

On our farm, we've watched archviz studios move from Forest Pack 6 and 7 scenes — five years of accumulated library presets, distribution recipes, RailClone-driven masterplans — into Forest Pack 9. The transition is generally smooth, but a handful of decisions around ForestIvy bundling, point-cloud viewport mode, and render-farm asset bundling are worth understanding before you upgrade a production pipeline.

This guide walks through what changed in Forest Pack 9 across its three release waves, how the new features behave in distributed rendering, and which considerations matter when you push FP9 scenes to a cloud render farm.

Forest Pack 9 release timeline

Forest Pack 9 has shipped in three substantive waves so far:

The FP9.0 release was described by CGPress and CGArchitect as iToo's "most ambitious release in years," with ForestIvy positioned as the marquee feature (CGArchitect, CGPress). The 9.1 and 9.3 follow-ups have added depth rather than direction — same engine, more polish.

Compatibility with 3ds Max 2026 was rolled out as part of the 2026 plugin update wave, alongside fresh builds for V-Ray, Corona, and Arnold. iToo's announcement reads: "All our plugins are now fully compatible with 3ds Max 2026 and the latest versions of V-Ray, Corona and Arnold" (cgconnect.chaos.com).

ForestIvy: Forest Pack 9's flagship plugin

ForestIvy debuted in FP9.0 as a procedural climbing-plants generator bundled into the Forest Pack Pro license — not a separate purchase. It ships with 30 high-quality leaf presets and a parametric workflow covering branching, gravity response, leaf distribution, and flowers (80.lv).

The 9.1 update added path-based ForestIvy, which means ivy can grow along 3ds Max splines without needing a surface to climb. In practice, this is the difference between "ivy on a wall" (FP9.0) and "ivy along a wrought-iron fence or trellis" (FP9.1). The 9.3 update added wind simulation with separate strength and speed controls for branches and leaves, plus tapered branches and branch-rotation randomization for less-uniform results (CGPress).

From a render-farm standpoint, ForestIvy behaves like the rest of Forest Pack: geometry is procedural and generated per-frame at render time on each node, not pre-baked into the scene file. This is the same constraint that has applied to Forest Pack scatter for years — if a node can't reach the library presets, the ivy silently fails to render. The same operational hygiene applies: keep library paths reachable, bundle custom presets with the project, and verify a small test frame before committing a long animation.

Corona 12 Update 1 specifically added support for ForestIvy via the Corona renderer, alongside other FP-specific integrations (Chaos blog). For V-Ray and Arnold pipelines, ForestIvy uses the standard Forest Pack instancing path.

Performance and memory improvements

The viewport rework in FP9.0 is the change you'll feel first in a dense scatter scene. The new point-cloud display is GPU-optimized and fixes point density regardless of object size — the GPU only updates on modification, which dramatically reduces viewport lag in scenes with hundreds of thousands of instances (80.lv). For archviz scenes with full ground cover plus mid-distance trees plus background forest, the improvement is meaningful before you ever submit a render.

A few other improvements carry through from earlier versions and continue in FP9:

• Animated sample storage cap. Forest Pack caps animated sample storage at 10 GB, preventing memory blow-ups during long animations where the per-frame sample cache would otherwise grow unbounded.
• LOD system. Forest Pack's LOD (Level of Detail) system switches geometry based on camera distance or screen size. A three-level LOD setup on a forest scatter typically reduces scene memory by 30–40 percent and cuts render time on background instances. This carries from FP7 and earlier; FP9 doesn't change the API.
• Camera frustum culling. Forest Pack auto-detects the active camera and eliminates geometry outside the 45-degree field of view. For an archviz hero shot, this can eliminate 60–80 percent of scattered instances at render time without touching the visible result. An "Expand" parameter lets you retain geometry slightly beyond the frustum so reflections and shadows still pick up the off-screen scatter.
• Multi-channel distribution maps. FP9.0 removed the single-mapping-channel constraint on distribution maps. You can now drive scatter density from multiple Map Channels without affecting the texture coordinates used for shading, which makes it easier to mix density gradients with texture variation in the same Forest object.

The memory and culling features matter more on a render farm than they do on a single workstation. A workstation rebuilds the scatter once; a farm with dozens of nodes rebuilds it per frame, per node. Anything that lowers the geometry footprint compounds across the farm.

Render engine integration in 2026

Forest Pack 9 is officially supported across the four engines most archviz studios actually use in 2026:

• V-Ray 7. iToo shipped a Forest Pack and RailClone build specifically for V-Ray 7, with support for ForestIvy on both V-Ray CPU and V-Ray GPU, plus Chaos Vantage interoperability (MotionMedia V-Ray 7, CGArchitect V-Ray 7). On our V-Ray cloud render farm we run Forest Pack scenes across V-Ray 5, 6, and 7 daily; the V-Ray 7 build is stable for ForestIvy in production use.
• Corona Renderer. Corona 12 (and Corona 12 Update 1) include specific ForestIvy support. Corona uses opacity maps rather than geometric trimming, so for plant materials you'll typically place edge maps in the material's opacity slot rather than relying on Forest Pack's Edge Trim (Chaos blog).
• Arnold. Forest Pack 9 supports the Arnold 7 series in 3ds Max 2025 and 2026. The instancing path uses Arnold's native instancing where possible, which keeps memory low on dense scatter.
• Redshift, Octane. Both renderers continue to consume Forest Pack instances via their standard Forest Pack bridges; ForestIvy specifically is well-tested on V-Ray and Arnold per public release notes, with Corona explicitly added in 12 Update 1. For Redshift and Octane pipelines on ForestIvy, do a short test render before committing a long animation.

iToo's official line for 3ds Max 2026 sums it up: Forest Pack, RailClone, and the free plugin set are "fully compatible with 3ds Max 2026 and the latest versions of V-Ray, Corona and Arnold" (iToo blog).

Migration from Forest Pack 6, 7, and 8

Forest Pack 6 to 7 was the messy migration. iToo's own forum has a long-standing thread on the lack of backward compatibility between FP6 and FP7 scenes, and several render farms — Rebus Farm among them — had to adapt their per-user farm deployment to handle the gap (iToo forum, Rebus Farm). If you still have FP6 scenes in the archive, opening them in FP9 may need a manual rebuild of the Forest objects.

Migration from FP7 or FP8 to FP9 is more straightforward in our experience. The library structure carries forward, scatter recipes survive the upgrade, and ForestIvy is purely additive — it doesn't disturb existing Forest objects. The change you'll notice first is the UI reorganization in FP9.0, which groups the most-used rollouts at the top and ships a redesigned toolbar with clearer icons. We've seen artists adapt to the new layout in a day or two; nothing under it changed at the API level.

For migration documentation specifics, iToo maintains a "What's New in ForestPack 9" page in their official docs that's worth a read before a studio-wide upgrade [RICHARD: cần confirm URL on docs.itoosoft.com/forestpack/whats-new/forest-pack-9].

Render farm operational considerations

A Forest Pack 9 scene behaves on a render farm the same way Forest Pack scenes have always behaved: the scatter geometry is generated procedurally on each node, for each frame. This has three practical implications worth keeping in mind:

Asset bundling matters. Library presets used by your scene need to be reachable from every render node. If a node can't resolve a preset's path, the affected scatter silently disappears from that frame — no error, just missing vegetation. We typically recommend either bundling custom presets with the project upload or maintaining a synced library on the node fleet. The same applies to ForestIvy presets in FP9.

UNC paths over mapped drives. For V-Ray proxies and Forest Pack library assets, UNC paths (\\server\share\path) are more reliable across a render fleet than mapped drives (Z:\, etc.), because mapped drives depend on per-user mount state on each node.

Render-only licensing. iToo's documentation has stated, for years, that network render nodes do not require a Forest Pack license — only interactive workstations do (iToo docs). Commercial render farms generally have their own arrangements with iToo for fleet deployment, so as a customer you typically don't need to provision render-node licenses yourself.

Distributed rendering and bucket parallelization. Forest Pack scatter and ForestIvy both work cleanly with V-Ray distributed rendering and standard bucket-based farm distribution. The procedural generation runs per-node, so each node only computes the scatter it actually renders — a key efficiency on dense scenes. Animation jobs benefit even more, since each frame regenerates the scatter from the same procedural seed, and a node never has to hold the full sequence in memory.

We include Forest Pack and RailClone in our supported plugin set across 3ds Max cloud rendering for V-Ray, Corona, Arnold, and Redshift workflows. For a closer look at the practical considerations of running Forest Pack and RailClone on a cloud farm, our Forest Pack and RailClone render farm guide walks through asset prep, distributed rendering setup, and the common failure modes we've seen across hundreds of archviz projects. If you're optimizing a large-scale scatter scene before pushing it to a farm, our Forest Pack optimization guide covers LOD setup, camera culling, and memory management in more depth. For animation-specific guidance, the Forest Pack animation workflow guide covers per-frame regeneration, sample caching, and motion blur — and our State of Forest Pack and RailClone on Cloud Render Farms 2026 report summarizes the cluster-wide observations from the last twelve months.

Where Forest Pack 9 fits in an archviz pipeline

If you're an archviz studio in 2026, the practical question is rarely "should we upgrade?" — Forest Pack 9 has been production-stable since FP9.1 in early 2025, and the 3ds Max 2026 compatibility removes the last reason to stay on FP8. The more interesting questions are:

• Where does ForestIvy fit? For exterior shots with planted facades, garden walls, pergolas, or trellis structures, ForestIvy replaces a workflow that previously meant hand-modeling or borrowing scanned assets. Path-based generation (FP9.1) widens the use case to non-surface geometry.
• Are your library presets paying their keep? The Library Browser improvements (faster loading, better navigation) make it easier to actually curate and use the 430+ included presets rather than defaulting to a small subset.
• Is your render-farm workflow set up to handle procedural per-frame generation efficiently? This is where LOD, camera culling, and library-path discipline pay off. A small upfront investment in scene preparation pays back across every render submission.

The 2026 release window is a good moment to revisit those questions — both because FP9 is stable enough to bet a season's worth of projects on, and because the 3ds Max 2026 compatibility update brings the whole iToo plugin set forward in lockstep with the host application.

FAQ

Q: When was Forest Pack 9 released, and what are the sub-versions? A: Forest Pack 9.0 was released on 26 September 2024. Forest Pack 9.1 followed in February 2025 with path-based ForestIvy and ForestSet helper improvements. Forest Pack 9.3 shipped in September 2025 with animated ivy (wind simulation), tapered branches, and additional ForestIvy presets. Compatibility with 3ds Max 2026 was rolled out as part of the 2026 plugin update wave.

Q: What's the biggest difference between Forest Pack 8 and Forest Pack 9? A: ForestIvy is the marquee addition in Forest Pack 9 — a procedural climbing-plants plugin bundled with the Forest Pack Pro license. Forest Pack 9 also introduced a GPU-optimized point-cloud viewport mode for dense scatter scenes, multi-channel distribution map support, and a reorganized UI. ForestIvy did not exist in Forest Pack 8.

Q: Does Forest Pack 9 work with 3ds Max 2026, V-Ray 7, and the latest Corona and Arnold builds? A: Yes. iToo shipped Forest Pack 9 builds compatible with 3ds Max 2026 and the current V-Ray 7, Corona, and Arnold versions during the 2026 plugin update cycle. Forest Pack also supports 3ds Max 2022 through 2026 and runs alongside RailClone with the same compatibility matrix.

Q: Do I need a separate Forest Pack license for my render farm? A: No. Per iToo's official policy, network render nodes do not require a Forest Pack license — only interactive workstations do. You can install Forest Pack on render nodes for non-interactive rendering (batch, distributed, backburner) without restriction. Commercial render farms typically handle fleet deployment under their own arrangements with iToo.

Q: Is ForestIvy a separate purchase, or is it included with Forest Pack 9? A: ForestIvy is bundled with the Forest Pack Pro license. It does not require a separate purchase. It ships with 30 high-quality leaf presets and includes both manual and procedural workflows for generating climbing plants on surfaces or along splines.

Q: How do I migrate a Forest Pack 6 or 7 scene to Forest Pack 9? A: Forest Pack 6 to 7 has a documented backward-compatibility gap on iToo's own forum, so FP6 scenes may need manual rebuild of Forest objects when opened in FP9. Migration from Forest Pack 7 or 8 to Forest Pack 9 is more straightforward — library structure, scatter recipes, and asset paths carry forward. Test a small frame first; ForestIvy is additive, so existing Forest objects are not disturbed by the upgrade.

Q: What's the practical impact of the new point-cloud viewport mode in Forest Pack 9? A: The point-cloud viewport is GPU-optimized and fixes point density regardless of object size, which dramatically improves viewport responsiveness on dense scatter scenes. For archviz scenes with full ground cover, mid-distance trees, and background forest, the difference is most noticeable when navigating or framing camera shots in the viewport — geometry is still generated at render time as before.

Q: How does Forest Pack 9 scatter behave on a cloud render farm with dozens of nodes? A: Forest Pack and ForestIvy generate scatter geometry procedurally per frame on each render node, not pre-baked into the scene file. Library presets and any custom assets need to be reachable from every node, or the affected scatter silently disappears from that frame. Distributed rendering and bucket parallelization both work cleanly with Forest Pack 9, and the LOD system plus camera frustum culling help keep the per-frame geometry footprint manageable on a fleet.