Workflow

This workflow tutorial teaches how to use HDR Light Studio with Cinema 4D via the Connection.

Ensure you have installed both the HDR Light Studio main application and the HDR Light Studio Connection plug-in for Cinema 4D.

       Warning: Cinema 4D MCP Server Default Settings Break HDR Light Studio - How to Fix

 

How It Works

HDR Light Studio works alongside Cinema 4D as a live lighting editor. You design the lighting in HDR Light Studio, and the Connection keeps your Cinema 4D scene updated with every change, using standard lights for your renderer.

•1. Prepare your scene - set up your final camera and remove any existing lighting.

•2. Create a lighting project - in the Connection panel, choose your renderer and create a new lighting project.

•3. Start HDR Light Studio - it opens connected to Cinema 4D. While you work, Cinema 4D uses fast, temporary low-res lighting, and the project shows as In Progress.

•4. Design your lighting - add lights and position them on your model, using whichever of the four methods suits your scene.

•5. Finalize - render high quality lighting textures to disk. The project shows as On Disk and is locked, ready to save, share and render anywhere, even without HDR Light Studio.

To change the lighting later, press Start, then Make Editable.

 

Before You Start: Prepare Your Scene

Set up your final camera.
If you move the camera after lighting, the reflections will move and spoil the lighting.

Remove existing environment lighting.
Keep any lights that are part of the product, such as an LED.

Tip: To edit an HDRI map already lighting the scene, hide it and load the HDRI into HDR Light Studio once it's open.

 

Open the HDR Light Studio Connection Panel

Go to the menu: Extensions > HDR Light Studio

The HDR Light Studio Connection panel opens.

Drag the panel and dock it into the Cinema 4D interface.
The connection still works when the tabbed panel is hidden behind another tabbed panel.

Tip: Save your Cinema 4D interface layout with the Connection panel included, so you don't need to do this every time.

 

Create a Lighting Project

Use the 'Set Renderer' drop-down in the Connection panel to choose your renderer.
This tells HDR Light Studio which renderer to create lighting for. In this example, we are using Redshift.

Press the 'Create New Project' button.
This creates a new HDR Light Studio lighting project for the chosen renderer.

The HDRLightStudio.Redshift project is created in the Cinema 4D Objects panel, containing an environment light for Redshift. It is also shown as the Active Project in the Connection panel.

New in build 2026.0923 and above
How new projects are named and placed
The name, location and layer of a new lighting project depend on what is selected when you create it:

•Nothing selected - the new project is created at the root of the Objects panel with the default name, e.g. HDRLightStudio.Redshift (or whichever renderer is being used).

•Group selected - the new project is created inside the selected group, named after the group, e.g. GroupName_HDRLS, and assigned the group's layer.

Creating a project inside a group keeps the lighting with its geometry, with a meaningful name and a layer that can be used with Takes. You can move the project or change its layer afterward.

Start HDR Light Studio

Please Note: Make sure HDR Light Studio is not already open (standalone, connected to another 3D app, or connected to another Cinema 4D session) before starting it from Cinema 4D, or the connection will not work correctly.

Press 'Start' in the Connection panel.

If HDR Light Studio doesn't start - here is help to solve the problem

HDR Light Studio opens, connected to Cinema 4D, and immediately takes control of the HDRI environment image in the active lighting project.

Temporary proxy lighting
While you design the lighting, HDR Light Studio shares the HDRI map with Cinema 4D as a temporary low-res image (a proxy). This is fast to calculate and fast for Cinema 4D to load. Each time the lighting changes, Cinema 4D is updated with a new temporary file with a random number at the end of its name, so the renderer always uses the latest image rather than a cached one.

New in build 2026.0923 and above
While using these temporary files, the project status in the Connection panel shows In Progress. Once you render the final lighting to disk, at the end of this tutorial, it changes to On Disk.

Tip: New in build 2026.0923 and above
You can also select the HDRLightStudio object in the Objects panel and press Edit in HDR Light Studio in the Attributes panel. This opens the Connection panel, makes the object the active project and starts HDR Light Studio in one step.
 

 

Choose How to Position Your Lights

There are four ways to position lights. Each suits different renderers, scenes and hardware, so understanding their pros and cons helps you pick the right one for your project. You can also combine them. We recommend trying them in this order.

 
Method 1: Stream the Cinema 4D render into HDR Light Studio (Arnold, Redshift and Octane only)
Click on your renderer's interactive render directly inside HDR Light Studio.
Pros: Everything is in one interface, showing your real materials. You can drag and drop preset lights straight onto the model.
Cons: Not supported by every renderer. Each click is a round trip to Cinema 4D, so it can be slower with heavy scenes.
Best for: Scenes that render quickly in Cinema 4D.
Learn Method 1...
 

 
Method 2: Use HDR Light Studio's internal Render View
Export the scene into HDR Light Studio and click on its built-in render, then check the result in Cinema 4D.
Pros: Very fast and responsive, even with heavy scenes, as it uses basic lighting with one simple shader and is built into HDR Light Studio. Works with every renderer, and you can drag and drop preset lights onto the model.
Cons: The scene is loaded twice, in Cinema 4D and HDR Light Studio, so it uses more resources. It does not show your real materials, but gives enough to get lights in the right places. You need both apps on screen.
Best for: Complex scenes that are too slow for interactive rendering in Cinema 4D. Export only the geometry you need, and check the lighting with test renders.
Learn Method 2...
 

 
Method 3: LightPaint in the Cinema 4D viewport
Click on the model in the Cinema 4D viewport to position lights.
Pros: Uses the least resources. Many renderers can show their interactive render in the viewport.
Cons: You can't drag and drop preset lights onto the model. It is less integrated, as you place lights in Cinema 4D, then switch to HDR Light Studio to adjust them.
Best for: Keeping resource use to a minimum.
Learn Method 3...
 

 
Method 4: Move lights by hand on the Canvas
Move lights around the HDRI map while watching the render in Cinema 4D, without using LightPaint.
Pros: Simple, with nothing to set up.
Cons: Slower, with more trial and error than clicking exactly where you want the light on the model.
Best for: Fine-tuning lights already placed with another method.
Learn Method 4...

The default interface layout
By default, HDR Light Studio opens with a layout ready for Method 1.

Tip: If your interface layout looks different, reset it by going to the menu: Window > Layout > Load > Default > Cinema 4D

Please Note: If you are using V-Ray, Corona or the native Cinema 4D renderers, the Render View [Cinema4D|Renderer] panel shows a message saying the feature is not supported. This is expected, as these renderers cannot currently stream their render to HDR Light Studio. Skip to Method 2.

Method 1: Stream the Cinema 4D Render into HDR Light Studio (Arnold, Redshift and Octane only)

Set a modest Render Resolution in Cinema 4D.
Streaming the render uses extra computer resources, so a sensible resolution stops large amounts of image data slowing down lighting and rendering.
Many scenes do not need an image larger than 1,000 x 1,000 pixels for the lighting process.
For example, using a render resolution of 5K would make no sense during the lighting process and would slow down the performance of lighting updates.

Please Note: Before pressing the Play button, make sure that no interactive render sessions are already running in Cinema 4D. HDR Light Studio starts the interactive render session for you. Starting another session in Cinema 4D while streaming will either run two sessions or stop the stream.

Press the Play button on Render View [Cinema4D|Redshift].

Cinema 4D starts an interactive render and streams the live render image into HDR Light Studio.
 
What you see in Cinema 4D depends on your renderer:

•Arnold - the render session runs hidden, with no panel opening in Cinema 4D.

•Octane - a Live Viewer window opens, showing EXTERNAL RENDERING text on a black view.

•Redshift - a Redshift RenderView panel opens and shows the render.

Drag and drop a Preset Light onto the model in this Render View.
By default, the light reflects in the model where you drop it.
With the LightPaint tool active, click on the model to move the selected light.
Learn about LightPaint here.

New in build 2026.0923 and above
LightPaint in this view is now much faster with heavy geometry. Only the first click has a delay, while the object is cached.

You can now skip to Making Area Lights.
 

Method 2: Use HDR Light Studio's Internal Render View

Here you position lights on HDR Light Studio's own fast, simple render of your scene, and see the final result in Cinema 4D.

Click on the Render View [HDR Light Studio] tab to bring it to the front.

Press the Play button on Render View [HDR Light Studio].

In the Import Scene Geometry panel, leave the settings at their default and press Import.

The Cinema 4D scene is exported as a temporary Alembic file and loaded into Render View [HDR Light Studio].
 
New in build 2026.0923 and above
Hidden objects, including those hidden by Takes, are not exported, so the Render View matches your scene.
To export only selected objects or change format, see Scene Export Options at the end of this page.

Drag and drop a Preset Light onto the model in this Render View.
By default, the light reflects in the model where you drop it.
With the LightPaint tool active, click on the model to move the selected light.

Check the result in Cinema 4D
Cinema 4D is updated with every lighting change. Start Redshift interactive rendering in Cinema 4D to see the lighting. You can leave it running while you work in HDR Light Studio.

The lighting positions in HDR Light Studio's Render View and the interactive render in Cinema 4D match. You will probably need two displays or one wide display to show both interfaces using this workflow.

Tip: If the scene is large and interactive rendering is too slow, just produce test renders from time to time instead of using interactive rendering.

You can now skip to Making Area Lights.
 

Method 3: LightPaint in the Cinema 4D Viewport

You can also position lights by clicking directly in the Cinema 4D viewport, using the LightPaint buttons in the Connection panel.

Close both Render View panels in the HDR Light Studio interface.

Drag and drop a light onto the Canvas.

Choose a LightPaint mode in the Connection panel in Cinema 4D, for example click on the Reflection button.

Click on the model in the Cinema 4D viewport - the selected light in HDR Light Studio moves to reflect at that point.
You can only click to position lights, dragging is not supported.

You can now skip to Making Area Lights.
 

Method 4: Move Lights by Hand on the Canvas

You don't have to use LightPaint at all. Add a light to the HDRI map and move it around the Canvas, watching the interactive render in Cinema 4D until the light is where you want it.
 
This needs more trial and error than clicking on the model, but it is a great way to fine-tune a light you have already placed with another method.

Making Area Lights

So far, all lights are on the HDRI map shared with Cinema 4D. You can also turn a light into an area light: a 3D light mapped with an HDR texture.

Please Note: Only lights with 3D mapping can be converted into area lights.

Enable the Area Light check box in the Light Properties panel for the selected light.

The lighting looks very similar, but several things have changed:

•1. The light in the Light List now shows as an area light.

•2. The light is removed from the shared HDRI map. It is still shown on the Canvas as seen from the center of the world, but it is no longer lighting the shot from the HDRI map.

•3. Area Light properties are added to the Light Properties, with a default Smart Dolly distance of 1,000 units.

•4. An area light is created in Cinema 4D for your renderer, mapped with the HDR texture and matching the size and position of the area light in HDR Light Studio.

Reduce the Smart Dolly slider value to move the light closer to the model.
 

 
The area light starts far away, giving a similar effect to the HDRI map. Moving it closer lets you see it in the Render View and in the Cinema 4D viewport.

If area lights are too close or too far away by default, adjust the Smart Dolly Scalar value in Preferences. This scales all area light distances in HDR Light Studio.

In Cinema 4D you can see:

•The area light in the viewport.

•The area light inside the active HDR Light Studio project in the Objects panel, for example inside the HDRLightStudio.Redshift group.

•The texture from HDR Light Studio mapped to the light properties. This texture updates when you change the light in HDR Light Studio.

Please Note: Renaming, deleting or duplicating HDR Light Studio area lights in Cinema 4D (or any part of their shader network or file nodes) will cause problems.

Move area lights with LightPaint, just like any other light, by clicking on the 3D model.

Finalize the Lighting: Render the Final HDR Textures

So far, Cinema 4D has been using low-res temporary textures to keep the lighting process fast. To finish, render high quality HDR textures to disk.

Press the 'Production Render' button in HDR Light Studio.
The top HDR button on the toolbar

Set your Production Render settings.
The 'Orientation' is already set for Cinema 4D and your renderer, so the HDRI map is orientated correctly. For more information, see Production Render Dialog.

Press Browse to choose a file location and name, then press Render.

The final HDR textures are saved to disk, and Cinema 4D is automatically updated to use them. The project status changes to On Disk.
The HDRI map will be named as shown.
Area Light textures will inherit the same HDRI map name with an additional unique suffix.

New in build 2026.0923 and above
The HDR Light Studio interface is now locked.
All panels are disabled, so the final lighting cannot be accidentally switched back to temporary files.

Go back to Cinema 4D.

Stop HDR Light Studio and Save Your Scene

Press the Stop button in the Connection panel.

HDR Light Studio closes and leaves your Cinema 4D scene with a complete lighting setup for your renderer. The scene uses standard lights and can be rendered anywhere, even on computers without HDR Light Studio.

Save the Cinema 4D scene.
The HDR Light Studio project is embedded in the Cinema 4D scene. Saving keeps your lighting design so it can be restored for later editing.
 

Editing the Lighting Later

Press Start in the Connection panel.
HDR Light Studio opens.
 
New in build 2026.0923 and above
As the project is On Disk, the interface and project are locked.

Press Make Editable in the Connection panel.

The project is unlocked, the scene switches back to temporary proxy files, and the status returns to In Progress.
The previous final textures stay on disk until a new Production Render overwrites them.

When you have finished editing, render the final HDR textures again so the project returns to On Disk.
 

       Scene Export Options

       Area Light Spread - Arnold, Redshift, V-Ray and Octane only

       Working with Multiple Lighting Projects

       Saving and Loading HDR Light Studio Projects