SRP Material Converter - HDRP to URP, HDRP to Built-in & more !

About SRP Material Converter - HDRP to URP, HDRP to Built-in & more ! – Unity Editor Tool & Plugin

SRP Material Converter - HDRP to URP, HDRP to Built-in & more ! Unity Asset Overview

Honestly, if you have ever bought a high-end environment pack on the Unity Asset Store only to realize it was built exclusively for HDRP (High Definition Render Pipeline) while your project targets URP (Universal Render Pipeline) or the legacy Built-in Render Pipeline, you know the headache. Standard Unity conversion tools frequently drop normal map channels, mess up metallic/smoothness texture packing, or flat-out fail when dealing with custom shaders.

The SRP Material Converter solves this exact architectural friction. It provides an extensible, non-destructive automated framework to remap shader properties, unpack and repack combined texture channels (like HDRP Mask Maps into URP Metallic/Smoothness maps), and convert entire folders of materials in seconds. In my experience across multi-platform titles, having a dedicated tool that safely handles cross-pipeline shader property translation saves dozens of hours of repetitive art-pipeline work.

Core Technical Features & Highlights

What makes this tool stand out from Unity's native pipeline converters is its deep understanding of how different SRPs handle texture channels and surface properties under the hood.

Texture Channel Remapping & Mask Map Baking

HDRP relies heavily on single packed Mask Maps (Red: Metallic, Green: Ambient Occlusion, Blue: Detail Mask, Alpha: Smoothness). URP and Built-in standard shaders, on the other hand, expect separate metallic and smoothness maps, often storing smoothness inside the Alpha channel of the Metallic or Albedo texture. This converter handles the underlying pixel operations automatically, extracting channels and saving properly packed target textures without requiring external software like Photoshop or Substance Painter.

Key Technical Capabilities

• Full Multi-Directional Conversion: Supports HDRP to URP, HDRP to Built-in, URP to HDRP, URP to Built-in, and reverse conversions seamlessly.
• Automated Channel Packing: Automatically splits and merges texture channels (Metallic, Smoothness, AO, Roughness) to match destination shader requirements.
• Batch Processing Engine: Target individual materials, active scene objects, or entire project directories in a single operation.
• Custom Shader Mapping Profiles: Create and modify ScriptableObject-based mapping rules to translate non-standard shader property names (e.g., matching _BaseColorMap to _MainTex).
• Non-Destructive Workflows: Preserves original materials by creating duplicate assets or backup presets before running bulk operations.

Ideal Use Cases & Game Genres

This utility fits cleanly into any developer's workflow where asset reuse across multiple target platforms is necessary:

• Mobile & Nintendo Switch Ports: When downscaling an existing desktop HDRP title to run efficiently under URP for performance-constrained hardware.
• Asset Store Integration: Integrating high-fidelity environment packs, character models, or prop sets originally built for HDRP into lightweight mobile or indie projects using URP or Built-in pipelines.
• Cross-Platform VR Titles: Converting PC VR shaders (often authored in HDRP or high-end URP configurations) to lightweight mobile VR formats targeting standalone hardware like Quest devices.
• Prototyping & Game Jams: Quickly kitbashing assets from mixed pipeline sources into a uniform target render pipeline without manual material re-authoring.

Quick-Start Unity Setup & Integration Guide

Integrating the tool into your Editor workflow takes under two minutes. Here is the step-by-step setup process I use in my own project setups:

1. Launching the Converter Window

Once imported into your Unity project, navigate to the top editor toolbar and open the editor panel via Window > Tools > SRP Material Converter (or the dedicated editor menu item). You will be greeted with a streamlined control window where you can choose your source and target render pipelines.

2. Programmatic / Automated Conversion Scripting

For custom editor scripts or automated import post-processors, you can invoke the conversion engine via C#. Below is an example showing how to programmatically sweep selected materials in an Editor utility script:

using UnityEngine;
using UnityEditor;
using System.IO;

public class MaterialConversionHelper : Editor
{
    [MenuItem("Tools/Custom/Convert Selected Materials to URP")]
    public static void ConvertSelectedToURP()
    {
        Object[] selectedObjects = Selection.GetFiltered(typeof(Material), SelectionMode.DeepAssets);
        
        int convertedCount = 0;
        AssetDatabase.StartAssetEditing();

        try
        {
            foreach (Object obj in selectedObjects)
            {
                Material mat = obj as Material;
                if (mat == null) continue;

                // Example logic targeting HDRP Lit shader switching to URP Lit
                if (mat.shader.name.Contains("HDRP/Lit"))
                {
                    Shader urpLitShader = Shader.Find("Universal Render Pipeline/Lit");
                    if (urpLitShader != null)
                    {
                        Undo.RecordObject(mat, "Convert Material to URP");
                        
                        // Preserve base map texture reference
                        Texture baseMap = mat.HasProperty("_BaseColorMap") ? mat.GetTexture("_BaseColorMap") : null;
                        Color baseColor = mat.HasProperty("_BaseColor") ? mat.GetColor("_BaseColor") : Color.white;
                        
                        mat.shader = urpLitShader;
                        
                        if (baseMap != null) mat.SetTexture("_BaseMap", baseMap);
                        mat.SetColor("_BaseColor", baseColor);

                        EditorUtility.SetDirty(mat);
                        convertedCount++;
                    }
                }
            }
        }
        finally
        {
            AssetDatabase.StopAssetEditing();
            AssetDatabase.Refresh();
        }

        Debug.Log($"[SRP Converter] Successfully converted {convertedCount} materials to URP.");
    }
}

Pros & Cons Assessment

Pros

• Massive Time Saver: Eliminates manual texture splitting and property copying across hundreds of materials.
• High Precision Channel Extraction: Accurately isolates roughness maps and inverts them into smoothness channels required by URP/Built-in shaders.
• Custom Scriptable Profiles: Allows dev teams using custom in-house shaders to map non-standard property names with custom ScriptableObjects.
• Clean Editor UI: Clear selection indicators, target pipeline previews, and responsive batch progress bars.

Cons

• Complex Custom Shader Graphs: Highly specialized visual node graphs with custom HLSL blocks still require manual shader logic recreation.
• Disk Overhead During Unpacking: Generating fresh split textures for metallic and smoothness maps creates new PNG/TGA assets on disk, which slightly inflates asset project size.

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