The Complete DGN to VRML Conversion Guide
General Information
This guide is part of the RapidPipeline 3D Formats Knowledge Database.It shows how to convert DGN to VRML, if you'd like to know more about the formats, please check out the following links:
Converting and Optimizing DGN Files to VRML
RapidPipeline can import DGN files, but currently doesn't support exporting to VRML format yet.
If you specifically need VRML export functionality for your workflow, please feel free to get in touch with us - we'd be happy to discuss your requirements and potential timeline for adding this export capability.
If you need, you can import VRML files and convert them to any of these 8 formats: FBX, glTF, OBJ, PLY, STL, USD, USDZ, and VRM.
In the meantime, you can explore other options on the 3D Formats Knowledge Database, which might serve as suitable alternatives for your workflow depending on your target applications and use cases.
What are DGN and VRML files commonly used for?
The DGN file is a format mostly used for CAD and infrastructure design data.
The VRML file is a format mostly used for web-based 3D content and virtual reality.
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Comparison of Features Supported by DGN and VRML
| Feature | Supported by DGN | Supported by VRML |
|---|---|---|
| Morph Targets | No | Partial0 |
| Rigid Animations | Partial1 | Yes |
| Skinned Animations | No | No |
| Animations | Partial2 | Yes |
| Free-Form Surfaces | Yes | Partial3 |
| Geometry Compression | No | Partial4 |
| Quad Meshes | Yes | Yes5 |
| Basic 3D Geometry | Yes | Yes |
| PBR Materials | Partial6 | No |
| Transparent Materials | Yes | Yes |
| Vertex Colors | Yes | Yes |
| Materials | Yes | Yes |
| Scene Composition | Yes | Yes |
| Hierarchical Scene Graph | Yes | Yes |
| Scene Nodes | Yes | Yes |
| Standardized Format | Partial7 | Yes |
| Embedded Textures | Partial8 | No |
| Multiple UV Channels | Partial9 | Partial10 |
| Normal Mapping | Partial11 | No |
| Procedural Textures | No | Partial12 |
| Texture Compression | No | No |
| Texture Transforms | Yes | Yes |
| Texturing | Yes | Yes |
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Limitations of DGN Files to VRML Conversion Workflow
The following limitations should be taken into account when converting DGN files to VRML format:
| DGN Feature (not supported by VRML) | Limitation Details |
|---|---|
| Free-Form Surfaces | Free-Form Surfaces Support: DGN: Full support | VRML: Partial support   VRML Notes: Limited NURBS support in VRML 2.0 Impact: Free-form surfaces allow a CAD user to design surfaces with advanced controls over curvature and continuitiy. While these surfaces are common for CAD models (in the form of so-called boundary representations or "B-reps"), they need to be converted to polygonal triangle or quad data to work with most 3D rendering engines - a process called tessellation. In this example, a surface patch is used to describe a part of a curved surface of a product. Without support for this feature, the free-form surface has to be tessellated into quads or triangles. |
| Embedded Textures | Embedded Textures Support: DGN: Partial support | VRML: No support   DGN Notes: Textures can be referenced or embedded Impact: Embedded textures allow the storage and exchange of an entire 3D model and its materials within a single file, by embedding the texture images directly into the 3D file (and not storing them as separate image files). Without support for this feature, textures have to be stored in separate image files, and referenced from the main 3D model file. |
| Normal Mapping | Normal Mapping Support: DGN: Partial support | VRML: No support   DGN Notes: Basic normal mapping for visualization Impact: Normal maps are used to model shading differences that are arising from small geometric details on a surface, such as fabric structures, visible gaps between bricks forming a wall, or rough rock surfaces. In this example, a normal map is used to model a fabric structure. Without support for this feature, the rendered fabric will look smoother than it actually is in the real world, as the fabric structure won't be visible. |
| PBR Materials | PBR Materials Support: DGN: Partial support | VRML: No support   DGN Notes: Limited PBR support in newer versions Impact: PBR materials enable Physically-Based-Rendering (PBR) for a standardized, photorealistic look of rendered images. PBR uses concepts like metallic-roughness or specular-glossiness properties and a microfacet-based modeling of the surface, using a concept called BRDF (Bi-Directional Reflectance Distribution Function). In this example, PBR materials are used to achieve realistic looking plastic and metal materials. Without support for PBR materials, only basic colors and shading can be used (for example, based on more simple shading models, such as the Blinn/Phong model). |
What's the best way to get DGN files into my 3D applications, and are there alternatives to using VRML?
Doing 3D conversion right, especially at scale, can be tricky, as 3D data is in general a rather complex (yet very powerful!) medium. This also applies to DGN and VRML files - the conversion guide above provides a rough first idea about that. Once you know what you would like to do, tools like RapidPipeline can help you perform the necessary steps, and to even automate the process for thousands or even millions of files.
Especially when introducing pipelines and workflows at scale in an enterprise context, it is usually good to rely on dedicated tools and expertise, making sure you do not introduce any steps into your 3D workflow that are detrimental to the final output's quality, or that take your team too much time (and money).
If you're interested to hire dedicated expertise from the best in the field to help your company reach your goals fast and reliably, please do not hestitate to contact DGG. Being the creators of RapidPipeline, and ambassadors for open 3D standards for more than a decade, we have been building some of the world's most advanced 3D pipelines, having processed many millions of 3D assets.
Therefore, our expertise will help you to reach your goals faster, at scale, and with the least possible friction, since we are focused on maximum interoperability.
To get started with 3D data conversion and optimization today, sign up for a free account!
If you have any questions, feel free to chat with our human team.
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