Lighting artists, rejoice: A new online library titled Open HDRI has launched, offering 25 high-quality HDRI environments for download, all under a CC0 license. That means: free for commercial use, no attribution demands, no licensing emails, no awkward conversations with Legal.

The emerging library comes from Grzegorz Wronkowski, a photographer with more than a decade of professional HDRI experience. His work has supported visualization and VFX pipelines since 2010 through platforms such as HDRMAPS, Viz-People and HDRI-Skies, with assets also licensed to tools like KeyShot, 3DCoat, Maxwell Render and Adobe Substance. He has produced sequential, location-based environment captures for CD Projekt Red during the early production phase of The Witcher 4 and more recently signed an agreement to supply new HDRIs for Poly Haven. Open HDRI is his independent project: a growing, free library designed for 3D artists, game developers and CG generalists, free from tracking cookies and analytics, recording only anonymous download counts.

Ultra-High Resolution and High EV Range

Lower-resolution variants such as 1K, 4K or 8K are available for viewport use, but the headline feature is ultra-high resolution: select HDRIs are provided at 29,696 × 14,848 pixels, with dynamic ranges between 12 and 27 EVs. Exterior captures generally fall toward the top of that range, delivering enough latitude for realistic relighting and accurate specular behavior even in physically-based workflows. The current set covers domestic, industrial and historic interiors as well as natural and urban exteriors under varied lighting conditions.

Why This Library Belongs in Production Pipelines

The CC0 licensing makes these assets frictionless in large pipelines: they can be used in commercial productions without attribution or rights management. The availability of 29K source material enables lighting for demanding output formats such as 8K deliveries, large projection environments or virtual production LED walls. The EXR format ensures physically meaningful light information, while the diversity of capture environments gives look-dev artists a useful spread of lighting scenarios for both grounded realism and stylized work. Since the library is designed with VFX, arch-viz and real-time engines in mind, Open HDRI fits cleanly into standard pipelines including Unreal Engine and Unity.

Most productions will gladly use the lower-resolution variants for previewing and general lighting due to reduced memory load and faster interaction. However, when final pixels matter, having 29K originals ready in the library allows teams to render high-resolution reflection and lighting passes without scrambling for replacements. Storage administrators may still groan, but at least they will groan in high dynamic range.

Building a Standardized Lighting Library

Studios looking to integrate Open HDRI should approach these assets with the same rigor as any purchased library. HDRIs benefit from tagging by resolution tier, with master files archived alongside lower-resolution proxies for rendering and real-time work. EV range and environment type should be recorded for search and retrieval during look development. Teams targeting real-time engines can generate mip-maps or bake lighting probes from the HDRIs to accelerate performance. Finally, maintaining context metadata like time of day, weather condition, interior versus exterior ensures matches for continuity and scene mood. Clear organization is often what separates useful lighting assets from those that become forgotten experiments on a server share.

More to Come

The current 25 HDRIs mark only the opening phase of the project. Wronkowski intends to release 10–25 new captures each month depending on community support, with donations helping to secure travel, bandwidth and equipment costs. Free does not mean costless, especially when delivering tens of thousands of pixels across a 32-bit dynamic range.

Download

Open HDRI library: https://openhdri.org

Scroll, download, light a scene, no account required.

The post Open HDRI: 25 Free 29K HDRIs (More to come) first appeared on DIGITAL PRODUCTION and was written by Bela Beier.

Lighting just got a new shape—yours. With the release of HDR Light Studio 9.1 (build 2025.0711, 17 July 2025), Lightmap has thrown out the rigid light primitives and handed artists a flexible, editable curve. Dubbed Lumi‑Curve, this new feature lets you draw freeform light strokes directly on the Render View, sculpting everything from stylized reflections to complex highlight trails in real time.

What Is Lumi‑Curve?

Lumi‑Curve is not another variation on the softbox. It is an entirely new, curve-based light type where the core is a line you plot and edit, not a fixed circle or rectangle. Each side of the curve can be independently softened or sharpened with falloff controls, allowing highly nuanced light gradients. You place control points (nodes) in the Render View, dragging and warping the curve to follow object contours or define unique light paths. The result updates instantly in both the HDR canvas and your connected DCC.

Use Cases: More Than a Pretty Arc

Lumi‑Curve is all about control and creativity where standard HDRI or primitive lights fall flat:

• Shaped Highlights: Create continuous, non-uniform highlights that flow across curved surfaces, eliminating the tiled or disconnected look from stacking multiple round lights.
• Glowing Arcs and Trails: Draw arcs behind a model for stylized background glows or graphic accents. When trails overlap, the brightness stacks additively, perfect for dynamic, motion-driven VFX or glossy product renders.
• Projector Mode: Set the curve’s “spread” to zero to turn it into a projected light brush—handy for painting animated highlights that follow the path of your line.
• Non-Linear Horizon Lines: Stretch a Lumi‑Curve across the HDRI canvas to create complex, curved horizon lines or to mask and structure environmental backgrounds. Artists can use these for both soft ambient transitions and hard-edged graphic beams.

Under the Hood: How It Works

• Control Points: Place and move nodes in the Render View to define and refine your curve’s shape.
• Falloff Gradients: Adjust the softness or hardness on either side of your curve with precise falloff parameters.
• Real-Time Feedback: See changes live both in HDR Light Studio’s canvas and in any connected DCC (3ds Max, Blender, Maya, Cinema 4D, Houdini, and more).

Platform, Plugins, and Pricing

HDR Light Studio 9.1 runs on Windows 10/11, macOS 11.4+ (Big Sur or later), and CentOS 7.9+ or compatible Linux distributions. Plugin support includes 3ds Max 2023–2026, Blender 3.6.12+ (including Apple Silicon), Cinema 4D 2023–2025, and others—maintaining the broad integration essential for pipeline artists.

Pricing for 2025: the ‘Indie’ tier has been dropped. Pro node-locked licenses are $540/year (up $95), Pro floating $1,140/year (up $165), Automotive node-locked $1,620 (up $125), and Automotive floating $2,460 (up $215). HDR Light Studio remains subscription-only.

The Takeaway: A Lighting Brush for 2025

Lumi‑Curve doesn’t just add a new shape—it changes the act of lighting into an act of drawing. From automotive-grade specular sweeps to stylized trails for motion graphics, the feature’s flexibility supports a new breed of artist-driven light design, all inside the familiar, DCC-linked HDR Light Studio interface.

As always, test new workflows in real production environments to confirm performance, stability, and expected results—especially with heavy HDR scenes and complex DCC links.

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Cited Sources:
// Lumi‑Curve reference, features, workflows // Lightmap: Lumi‑Curve Content Reference
// Official release notes, system/platform requirements // Lightmap: HDR Light Studio 9.1.0 Release Notes

The post HDR Light Studio 9.1 Lumi‑Curve Turns Lighting into Line Art—Literally first appeared on DIGITAL PRODUCTION and was written by Bela Beier.