HDRI Sphere Generator Guide for 360 Lighting Environments

Settings Reference

Generation controls

These settings define the base lighting environment.

• Mode: Switches between text-driven environment creation and image-based conversion. Use text mode for invention and image mode for matching or transforming a known source.
• Environment Option and Environment Style: Set the broad sky/environment family and the visual interpretation of that family. Pick environment option for scene category and environment style for mood or realism level.
• Time of Day, Cloud Density, and Sun Position: These are the biggest lighting-shape controls in the tool. Use them to control horizon warmth, contrast, shadow angle, and sky drama before touching anything else.
• Resolution: Sets the panorama size for reflections and lighting quality. Use higher resolutions when specular reflections or close-up environment fidelity matter.
• Preserve Original Look: Keeps the result closer to the source or selected baseline. Keep it enabled when matching concept direction matters more than experimentation.

Preview, seam, and orientation controls

These controls determine whether the HDRI is usable in practice, not just pretty in isolation.

• Seam Fix Enabled and Inline Seam Mode: Applies deterministic edge harmonization after generation, with inline Off, Standard, and Pro seam review modes in the preview area. Keep seam fix on for production HDRIs and compare inline seam modes when the left-right join is visible in the 360 viewer or reflection tests.
• Yaw Rotation: Rotates the panorama horizontally so the main light or scene feature lands where you need it. Use it when the sun or hero skyline should face camera, model, or scene framing differently.
• Bake Rotation: Applies the previewed orientation into the exported asset. Enable it when the downstream tool expects the file itself to arrive pre-rotated.
• Strict 2:1 Conversion: Ensures the panorama is valid for systems that require exact equirectangular proportions. Use it when a renderer, engine, or export target is strict about HDRI geometry.
• Export Preset: Prepares orientation behavior for a neutral or target-specific output pattern. Use the preset when you know the destination pipeline and want fewer manual corrections.
• PNG and HDR Export: Exports the generated panorama as a standard image preview or converts it to HDR data for lighting workflows. Use PNG for visual review and web-friendly sharing; use HDR when the target renderer needs environment-light data rather than only an LDR sky image.

Workflow

Create HDRI environment maps for lighting, reflections, and global illumination with controls for environment type, style, time of day, clouds, sun position, seam fixes, and export orientation.

Step 1: Choose text-to-HDRI or image-to-HDRI

Text-to-HDRI is best when you are designing the environment from scratch. Image-to-HDRI is best when a concept, matte, or sky reference already exists.

Step 2: Lock the environment logic before the scene prompt gets long

Environment type, style, time of day, cloud density, and sun position establish the lighting behavior. Use the prompt to refine the atmosphere, not to replace these controls.

Step 3: Check seams and orientation in the inline viewer

Use the 360 preview, seam score, seam fix mode, yaw rotation, and strict 2:1 conversion tools before export. Lighting problems are easier to solve here than after engine import.

Step 4: Export for the engine or renderer you actually use

Make rotation and orientation decisions intentionally. Different pipelines care about yaw offset, baked rotation, and strict aspect handling.

Common Pitfalls

• Do not write huge prompts before setting the sky and lighting controls.
• Do not ignore seam behavior just because the static preview looks good.
• Do not export without checking orientation if the engine expects a different default front.

What matters most in HDRI generation?

The biggest levers are environment family, time of day, cloud density, sun angle, and seam quality. The prompt refines those decisions instead of replacing them.

Why does yaw rotation matter?

It changes where the most important light and skyline features land in relation to the scene, which directly affects reflections, rim light, and mood.