Converting a Project from the Built-in Renderer to the High Definition Render Pipeline

The High Definition Render Pipeline (HDRP) uses a new set of Shaders and lighting units, both of which are incompatible with the Built-in Renderer. To upgrade a Unity Project to HDRP, you must first convert all of your Materials and Shaders, then adjust individual Light settings accordingly.

This document explains how to convert the 3D With Extras template Project to HDRP, but you can use the same workflow to convert your own Project. To follow this document and upgrade the 3D With Extras Project, create a Project that uses the 3D With Extras template. To do this:

  1. Open the Unity Hub.

  2. In the Projects tab, select New.

  3. In the Template section, select 3D With Extras.

  4. Enter a Project Name and set the Location for Unity to save the Project to.

  5. Click Create.

  6. The Unity Editor opens and looks like this:

Setting up HDRP

Firstly, to install HDRP, add the High Definition RP package to your Unity Project:

  1. Open a Unity project.
  2. Open the Package Manager window (Window > Package Manager).
  3. In the Package Manager window, in the Packages field, select Unity Registry.
  4. Select High Definition RP from the list of packages.
  5. In the bottom right corner of the Package Manager window, select Install. Unity installs URP into your Project.

HDRP is now available to use in your Project. Note that when you install HDRP, Unity automatically attaches two HDRP-specific components to GameObjects in your Scene. It attaches the HD Additional Light Data component to Lights, and the HD Additional Camera Data component to Cameras. If you do not set your Project to use HDRP, and any HDRP component is present in your Scene, Unity throws errors. To fix these errors, see the following instructions on how to set up HDRP in your Project.

To set up HDRP, use the Render Pipeline Wizard.

  1. Open the Render Pipeline Wizard window (menu Window > Render Pipeline > HD Render Pipeline Wizard).

  2. In the Configuration Checking section, go to the HDRP tab and click Fix All. This fixes every HDRP configuration issue with your Project.

HDRP is now set up inside your Project, but your Scene does not render correctly and uses the magenta error Shader to display GameObjects. This is because GameObjects in the Scene still use Shaders made for the Built-in Renderer. To find out how to upgrade Built-in Shaders to HDRP Shaders, see the Upgrading Materials section.

HDRP includes its own implementation for post-processing and no longer supports the Post Processing package. If you are converting the 3D With Extras Project, or if your own Project uses the Post Processing package, remove the Post Processing package from the Project. To do this:

  1. In the Unity Editor, open the Package Manager window (menu: Window > Package Manager).

  2. Find and select the Post Processing package, and click Remove.

For details on how to add and customize post-processing effects to the template Project, see the post-processing section.

Upgrading Materials

To upgrade the Materials in your Scene to HDRP-compatible Materials, either:

  • Upgrade Project Materials to High Definition Materials: Converts every compatible Material in your Project to an HDRP Material.

  • Upgrade Selected Materials to High Definition Materials: Converts every compatible Material currently selected in the Project window to an HDRP Material.

  • Upgrade Scene Terrains to High Definition Terrains: Replaces the built-in default standard terrain Material in every Terrain in the scene with HDRP default Terrain Material.

You can find these options in either:

  • The Edit > Render Pipeline menu.

  • The Render Pipeline Wizard window, inside the Project Migration Quick-links section.

This process cannot automatically upgrade custom Materials or Shaders to HDRP. You must convert custom Materials and Shaders manually. Also, since HDRP supports more height map displacement techniques and decompression options, this processes cannot upgrade heightmap related properties correctly. This means your height mapped materials may look incorrect. If you upgrade a Material that uses a heightmap, modify the Material's Amplitude and Base properties until the result more closely matches the Built-in Renderer version.

This process also cannot upgrade particle shaders. Even though HDRP does not support particle shaders, it does provide some Shader Graphs that are compatible with the Built-in Particle System. These Shader Graphs work in a similar way to the built-in particle shaders. To use these Shader Graphs, import the Particle System Shader Samples sample:

  1. Open the Package Manager window (menu: Window > Package Manager).
  2. Find and click the High Definition RP entry.
  3. In the package information for High Definition RP, go to the Samples section and click the Import into Project button next to Particle System Shader Samples.

Converting Materials manually

The HDRP Material converter automatically converts Built-in Standard and Unlit Materials to HDRP Lit and Unlit Materials respectively. The process uses an overlay function to blend the color channels together, similar to the process you would use in image editing software, like Photoshop. To help you convert custom Materials manually, this section describes the maps that the converter creates from the Built-in Materials.

Mask maps

The Built-in Shader to HDRP Shader conversion process combines the different Material maps of the Built-in Standard Shader into the separate RGBA channels of the mask map in the HDRP Lit Material. For information on which color channel each map goes in, see mask map.

Detail maps

The Built-in Shader to HDRP Shader conversion process combines the different detail maps of the Built-in Standard Shader into the separate RGBA channels of the detail map in the HDRP Lit Material. It also adds a smoothness detail too. For information on which color channel each map goes in, see detail map.

Adjusting lighting

HDRP uses physical Light units to control the intensity of Lights. These units do not match the arbitrary units that the Built-in render pipeline uses.

For light intensity units, directional Lights use Lux and all other Lights can use Lumen, Candela, EV, or simulate Lux at a certain distance.

To set up lighting in your HDRP Project:

  1. Add the default sky Volume to your Scene to set up ambient lighting (menu GameObject > Volume > Sky and Fog Volume).

  2. Set the Environment Lighting to use this new sky:

    1. Open the Lighting window (menu: Window > Rendering > Lighting Settings).

    2. For the Profile property, select the same Volume Profile that the Sky and Fog Volume uses.

    3. For the Static Lighting Sky property, select PhysicallyBasedSky.

    4. Optionally, if you don't want Unity to re-bake the Scene''s lighting when you make the rest of the changes in this section, you can disable the Auto Generate checkbox at the bottom of the window.

  3. Currently, the shadows are low quality. To increase their quality, you can change shadow properties:

    1. Create a new Global Volume GameObject (menu: GameObject > Volume > Global Volume) and name it Global Settings.

    2. Create a new Volume Profile for this Volume. To do this, open the Inspector for the Volume and click the New button.

    3. Add a Shadows override (Add Override > Shadowing > Shadows), then enable Max Distance and set it to 50.

  4. On the Light that represents the Sun (which is the Light component on the Directional Light GameObject), set the Intensity to 100000 and the Color to white. Then, to see the sun in the sky, go to the Shape section and set the Angular Diameter to 3.
  5. The Scene is now over-exposed. To fix this, select the Global Settings GameObject you created in step 3a and add an Exposure override to its Volume component (Add Override > Exposure). Then, set the Mode to Automatic.
  6. To refresh the exposure, go to the Scene view and enable Animate Materials.

  7. Correct the Light cookie, because HDRP supports colored light cookies, and the Built-in light cookies use a texture format that only contains alpha:

    1. In the Project window, select Assets > ExampleAssets> Textures > Light_Cookies > Spotlight_Cookie.

    2. In the Inspector, change the import type from Cookie to Default.

    3. Set the Wrap Mode to Clamp. .

  8. Correct the construction Light:

    1. In the Hierarchy window, select ExampleAssets > Props > ConstructionLight > Spot Light and view the Light component in the Inspector.

    2. Change the Intensity to 17000 Lumen. This is to represent two 8500 Lumen light bulbs.

    3. In the Emission section, enable More Options.

    4. Enable the Reflector checkbox. This simulates a reflective surface behind the spot Light to adjust the visual intensity.

  9. Make the light bulb Material emissive:

    1. In the Project window, select Assets/ExampleAssets/Materials/Lightbulb_Mat.mat.

    2. In the Emission Inputs section of the Inspector, enable Use Emission Intensity, set Emissive Color to white, and set the Emission Intensity to 8500 Luminance.

  10. Finally, if you disabled Auto Generate in step 2d, go to the Lighting window and press the Generate Lighting button. You can also re-enable Auto Generate.

Post-processing

HDRP no longer supports the Post Processing package and instead includes its own implementation for post-processing. To convert the Scene to HDRP post-processing:

  1. In the Hierarchy, delete the Post-process Volume GameObject.

    1. If your Project used the Post Processing package's Scripting API to edit post-processing effects, you need to update your scripts to work with the new post-processing effects.
  2. Create a new Global Volume GameObject (menu: GameObject > Volume > Global Volume) and name it "Post-processes". You can find all the post processes in the Post-processing sub-menu when you select Add Override in the Volume Inspector.
  3. Add a Tonemapping override to the Volume (Add Override > Post-processing > Tonemapping) then enable Mode and set it to ACES.
  4. Add a Bloom override to the Volume (Add Override > Post-processing > Bloom) then enable Intensity and set it to 0.2. Note that the result of the bloom is not the same as the one in the Post Processing package. This is because HDRP's bloom effect is physically accurate, and mimics the quality of a camera lens.

  5. Add a Motion Blur override to the Volume (Add Override > Post-processing > Motion Blur) then enable Intensity and set it to 0.1.

  6. Add a Vignette override to the Volume (Add Override > Post-processing > Vignette) then set the following property values.

    1. Enable Intensity and set it to 0.55.

    2. Enable Smoothness and set it to 0.4.

    3. Enable Roundness and set it to 0.

  7. Add a Depth Of Field override to the Volume (Add Override > Post-processing > Depth Of Field) then set the following property values:

    1. Enable Focus Mode and set it to Manual.

    2. In the Near Blur section, enable Start and set it to 0 then enable End and set it to 0.5

    3. In the Far Blur section, enable Start and set it to 2 then enable End and set it to 10. Note that this effect is only visible in the Game view.

  8. Finally, select the Global Settings GameObject to view it in the Inspector. In the Volume component, add an Ambient Occlusion override (Add Override > Lighting > Ambient Occlusion), then enable Intensity and set it to 0.5.

Result

Now the Scene in the Game view should look like this: