If you’re into SADX modding, you’ve probably seen this video by NVIDIA showcasing modded SADX, the announcement of a “$50,000 RTX Remix Mod Contest”, and probably some of the drama that ensued.
At first, I was really happy to see SADX featured, it’s even right at the start of the video! Unfortunately, with regard to Sonic Adventure/DX, the video does a great deal of misrepresentation, a lot of work showcased in the video is uncredited, and the intentions of the people behind the RTX mods/hacks for SADX are questionable to say the least.
Which game is actually used in the video?
Let’s start with the video itself. Here’s a still frame from the beginning of the video. What does this look like?

If you’re aware of the differences between Sonic Adventure ports, you can easily recognize this is SADX PC with the Mod Loader. Even if you aren’t familiar with the differences between Dreamcast and DX Emerald Coast, the dead giveaway is Sonic’s pose, which he doesn’t use normally. It appears to be Sonic’s “skidding on slope” animation (or an edit of it), which can be seen in the Autodemo prototype, where Sonic’s Light Speed Attack worked differently. To get Sonic to display this animation, his action ID needs to be changed in the player data structure. This can be accomplished with Cheat Engine if you are familiar with the game’s internals and know the exact address, but the most likely way they did it was by using the “Event Animation Editor” feature of Speeps’ Meme Maker mod. The camera zoom-in could’ve been done manually or with Meme Maker’s Camera Editor. Among other mods it is obvious that the video used Dreamcast Conversion (but without Lantern Engine) and some kind of Sonic model mod based on the SA1 Dreamcast Sonic model (previously Kaori claimed it was their model, but later retracted the claim). None of the above are ever mentioned or credited in the video.
In the part of the video where “Sonic Adventure Remixed” is showcased, it is clear that Dreamcast Conversion is still being used because you can see the vertex distortion effect on the ocean waves from the Dreamcast version.

This effect was removed in SADX, and a slightly edited version of it is restored in the Dreamcast Conversion mod. I talk about this effect on the Dreamcastify blog.
What is “Original Game”?
So, with the above we’ve established that the version of the game shown in the video is definitely using the Mod Loader and various mods. Next, let’s have a look at the snapshot below.

At the bottom left, it says “Original Game”, which is a gross misrepresentation. If they mean “Sonic Adventure DX” as the logo on the top left implies, there is no way this would qualify as the “original game”. To start with, not a single version of Sonic Adventure DX uses the Dreamcast version’s ocean textures in this level. So “Original Game” is actually the 2004 PC port of Sonic Adventure DX modded with the SADX Mod Loader and the Dreamcast Conversion mod (and likely some kind of texture upscale mod), at the very least.

Another thing I find particularly unfortunate is the way the lighting is misrepresented. It looks fullbright in the “Original Game” part of the video because the Lantern Engine mod was disabled. One of the major differences between Dreamcast and DX level models is that the DX models have baked-in vertex colors to compensate for the removal of Lantern Engine. The Dreamcast levels, on the other hand, do not have vertex color data. As a result, if you don’t use Lantern Engine, there will be no lighting on Dreamcast levels among other things. That’s one of the reasons this warning appears when you start the game with Dreamcast Conversion but without Lantern Engine:

Yes, I know they had to disable Lantern Engine because it’s not compatible with RTX Remix. That’s no excuse for failing to represent either version of the game, especially since they have graphical differences, which are the main point of comparison in the video! Whether or not that was intentionally misleading or just someone’s lack of competence, I don’t know. But if you want to know what “original game” looks like, here it is:
Here’s a link to the MP4 file if the video doesn’t play.
Just a reminder: this is the actual product that was released for PC as “Sonic Adventure DX” in 2004. Looks a bit different without the Mod Loader, doesn’t it? Many people don’t realize or just take for granted the work we did in the Mod Loader over the years to fix various issues in the game. The original port doesn’t even set the window size correctly on 16:9 screens in windowed mode, not to mention the low precision Z-Buffer and lack of mipmaps. The Steam version has some of these issues fixed (adding a whole bunch of its own), but it isn’t compatible with the Mod Loader and, since it doesn’t use a fixed pipeline renderer, it isn’t compatible with RTX Remix in the first place.
To sum up, I think it’s an unfair comparison. Part of me wants to believe the video was made in good faith, so here’s how I think this part could’ve been done better:
- They could’ve compared against the original Dreamcast, Gamecube, PC (2004 or Steam) version of the game without hacks or mods, with clear indication of what version of the game is used.
- If they had to use the modded 2004 PC port, they could’ve disabled Dreamcast Conversion for a more accurate representation of the 2004 PC port.
- If they had to have Dreamcast Conversion enabled, they should’ve recorded the “Original Game” part with Lantern Engine. Of course, even with that the “Original Game” bit is questionable, but at least they wouldn’t be mixing Dreamcast levels with SADX PC lighting, so it would be closer to the Dreamcast version, which is the “original game” after all.
- Instead of “Original Game”, it should’ve said “RTX Off”, which is probably what they meant to say anyway.
- The developers of the Mod Loader and all the mods that appear in this video should’ve been consulted with beforehand, and a list of used mods and tools should’ve been included in the video or in its description, ideally with proper credits.
The last point in particular is really unfortunate because the developers of the RTX mods are credited at the end of the video, but nobody else is. Which brings me to the next thing I want to discuss.
Is it okay for a corporation to use uncredited fan work to promote their product?
Let’s look at some simple facts:
- NVIDIA uploaded a video showcasing various RTX Remix mod projects for different games, which include RTX mods for Sonic Adventure DX.
- The Sonic Adventure DX part of the video showcases the “Sonic Adventure Remixed” project, which uses the Mod Loader and Dreamcast Conversion (and possibly other mods) as dependencies. In addition, the “Original Game” part of the video misrepresents the original game by using a modded version with the Mod Loader and a mismatched mod set.
- The developers of the Mod Loader and mods, including Dreamcast Conversion, are not credited in the video, and there was zero communication from NVIDIA or the developers of “Sonic Adventure Remixed” with us regarding the use of our work in the video.
- The video is a promotion for a “$50,000 RTX Remix Mod Contest”.
Overall, I think it’s really bad taste and a misrepresentation of both the game and our work.
Is it okay for “Sonic Adventure Remixed” to take part in NVIDIA’s contest?
I have seen some of the strangest tweets and comments on this matter, so let me clarify several points I thought were obvious:
- I do not claim ownership of original SA1 Dreamcast assets. I also do not claim ownership of the ideas, bug fixes or concepts implemented by me in Dreamcast Conversion, the Mod Loader or any other SADX projects I’ve been involved in.
- Needless to say, our work, including mine, involves Sega’s copyrighted assets and code, and it cannot be used in any commercial project in principle. From the legal point of view, we are at Sega’s mercy entirely, and it’s extremely generous of Sega to allow our projects to exist at all.
- I do not have the legal right to prevent people from using my work.
- At the same time, I feel like I have a reasonable moral right to request for my work not to be used in contests with monetary awards, or in promotion of other products.
I have seen people say things like, “funny how these modders who use Sega’s stuff without permission are so protective of their mods when the same thing happens to them”. In my case at least, I don’t mind if someone uses Dreamcast Conversion or the Mod Loader as a dependency. I have a problem when my work is used in another project where money is involved in any capacity.
Because of the Mod Loader’s accessibility, many people seem to think Sonic Adventure DX is easy to hack and mod. Perhaps Dreamcast Conversion is just copying some files to replace SADX models and textures with their Dreamcast counterparts from the Dreamcast version so it isn’t even worth crediting? For anyone who thinks so, I encourage you to have a look at the unmodded PC version of SADX and a GDROM rip of the Dreamcast version and see if you can figure it out. Years of research engineering and tool development by dedicated enthusiasts went into these mods and tools, and taking this all for granted is an insult to all the work that was done over these years.
For Dreamcast Conversion, you can get some ideas from the Dreamcastify blog, but there’s much more work behind the scenes. I’m tired of talking about this for so many years. If someone can make the PC version look like the Dreamcast original or better WITHOUT RELYING ON DREAMCAST CONVERSION – more power to them, and feel free to use the documentation on the Dreamcastify blog! In fact, I will be happy if someone makes a better alternative. For now, though…
Request to the developers of Sonic Adventure DX RTX mods (and anyone else with similar ideas)
If you intend to get involved in any commercial projects or participate in contests with monetary awards, please rebase your work to not use Dreamcast Conversion as a dependency. I would like to make it clear that I am not affiliated with NVIDIA or any of Sonic Adventure DX RTX projects. Dreamcast Conversion is a strictly non-commercial fan project, and its usage in the RTX Remix video was done without prior consent. I do not consent to entering any of my work in contests with monetary awards, as dependencies or otherwise.