Maybe this link can help you as well

http://www.watto.org/game_extractor.html 

While trying to unzip the chasmmap editor I chunked on an error.
Just tinkering a bit with the ventilation shaft.
Hard to get the velocity right, as quake uses 0.1 sec /frame.
Not bad afterall, see what I can do.

ventilator
wadfile

The wad is just the start of the ventilation shaft.
It is slow, I know. 

You can get 0.05s frames with this trick: https://tomeofpreach.wordpress.com/2016/02/10/high-fps-texture-animations/

Nice vent. 

I messed with it and the problem is there are too many blades. With less blades it would not be a big deal to make it go faster but, with so many tiny blades anything past this speed is either going to look like it's moving backwards or moving very slowly forward.

I also removed your "lump" in the spin. Well, as much as possible considering the center is not round.

vent.wad

vent.gif 

vent_b.gif
vent_b.wad 

If you want to make this yourself due to some anomaly or whatever that my version may contain but like the fan speed....

I rotated the blade from 0 to 50 degrees over 5 frames at 10 frames a second. Up to 53 degrees still looked pretty smooth. Anything less than 50 or more than 53 started creating problems. Trying to use less than 5 frames and capture only a blade width of spin was too obvious. Using more than 5 frames produced results that were no better than the 5 frame way. I'm pretty confident I got it about as good as you can expect considering the graphic and the FPS. 

work Gypsy. That is a lot better.

I used three animated pares of frames to influence the velocity, but with Qmaster's hint I'll try out Preach concept.

As I dived into the Chasm game further, I decided to redraw the whole texture file into a wad file.
Some textures become pale as the chasm pal is different to Quake, but the most come out good.
Another thing is quake hasn't transparant textures, or I have to change them to sprites which is ugly.
Better to fill them up to a better content.

The map editor is more stubborn, I never got Doom maps right. As the monsters they're quiet hard to purchase. But I like a challenge. 

I then brought it into flash, drew 2 concentric circles to break out the blades and from there simply created a little 5 frame timeline with a motion tween. It was cake from there. I just kept adjusting the final frame rotation til it looked as good as I can get it.

I made some tiny edits to the non-moving parts of the image to get rid of some little white dots where my blade cutout wasn't elite and simply exported every frame of the tween.

This is why I am confident it is basically as good as it's going to get. All of the work was in adjusting the final rotation and I tried pretty much every number between 20 something and 360. I also tried a few numbers based on 360+(>50) after I nailed that 50 is basically the hotspot. I also tried more frames that attempted to edge the number past 50 a bit. What I gave you is the best results that all of those tests provided +/- a final degree or 2. Part of my goal was to do it in as little frames as possible. I tried between 3 and 10 frames. 5 frames seemed to be the hotspot.

I still have the project open. If you see something small you don't like I can probably fix it really fast. 

Strange how my first attempt with a screenshot just blew me out of sight. Then I took half the picture, tried to blend it mirrored/flipped on top and gave up.

Then I realized it was dosbox that screwed it up, so I took one printscreen, recovered the raindrops and gave it a three degrees turn.
In CorelDraw5 I can melt parts of them and after 27 degrees I had 10 frames. (max frames for animations dew to the zero).

I'm still amazed what you did with it, didn't expect to see the outcome so good.
Preach's method can work also, but I'm so ferocious when it comes to using entities for textures. 

my results plus preach's method should result in a 2x speed version of my results.

@amazed what I did with it

Well, people can say whatever they want about flash but, these simple tweens is one of it's main purposes.

How much easier could you possibly get?

screenshot 

So I did a small compare, I'm not that good in hybrids. What I do no is I think your solution is still better compared to Preach. Or you should hussle in the funk model. I tried to speed it up, but it is locked to the 0.1 sec gate.

I think the best way to get it better is make it a static entity. 

They all look wrong. I made a quick bsp with my wad version. I was blown away by how shitty it was. I kept tweaking my wad with new rotations and then testing in a map and it's garbage, bro. There is no way at such a super slow framerate to make the fan blow fast and smooth. I made numerous edits to the image to clean up a bunch of garbage that was way more visible at 256x256 quake units than at 256x256 pixels. I have the animation down to 3 frames but it is slow as shit.

vnt.wad

You are more than welcome to use it but, IMO whereas this is probably my best one, on multiple levels, all of my attempts are less than desirable. Unfortunately, I don't see any way to make this better without using Preach's method. 

I saw that one coming. It's a tricky way to make it go. I did earlier animated textures and got blown away by the low frame rate, and the fact it only works on 10 frames.
Nevermind, it's only Quake and I like it.

I wondered if the Chasm already had a Quake wad file already?
All info on Quakaddicted seems vanished.

So I made a static of it, it needs only 15 frames and the velocity seems well. Another backdraw is the texture is screwed as it comes on 302x 108 size. Maybe if I hussle the skin file I can stretch it a little.

Thanks for the inspiration!

static fan 

The skin is terrible but, you hussled that fan like a true hussler ;). I like how you put a little bit of drag in the spin. Nice touch. 

Madfox, if you are working on Chasm texture conversion, please do it as close as possible to the original, otherwise I'll be sad and disappointed.
I can help you with palettes, but imo best way would be to make Chasm palette into Quake.

I can help you with QuakeC later if you want. 

Groundbreaking tech from 2005. 

@gypsy - I was mistaken about the skinsize. It looks that it's width 308 / height 94 archives.
So I can make it three times bigger. Also it is possible to put the same parts behind eachother.
That way it will become even smaller, which solves the resolution three times higher.

Fine things could be made turning the thing into an entity. That way it would act like a fan with three stages of velocity. Also the possiblity would be created to shoot the thing and use it as a secret passthrough.

@kreathor - While converting the *.cel pictures I was confronted with the fact that chasm.pal has much more brown and grey colours than the quake pallet. So while I was converting them back to Q.pal with Wally some of them suddenly bleached out. I made note of that ones, as I could always fill them up with some more clours. But this is not the same as the original. Also there are a lot of them using the pink transparant colour like Doom.
Quake has no transparant colours for textures, only for sprites.

This is how far I came with the Chasm.wad. It's only temperary, just for testing. Most textures do come out fairly bright. Take a look and tell me what you think.
Chasm Test Wad

@onetruepurple - yes, that would be an idea. Although the file would become rather large. 

I'm not sure actually how much a TGA of a 64x64 8-bit image would weigh, but I don't imagine it would be too much.

Right now I'm on my phone but you can check out the Doom textures in Quoth's pak0.pak. 

I was converting them back to Q.pal with Wally some of them suddenly bleached out.

I found that Wally has problems with managing colors in most cases. Textures become brighter than from TexMex.

2nd thing is that doing direct palette swap gives worst results. What you would like to do is to convert textures with dithering. All colors that are not available, will be "simulated" by dithering. It doesn't work for all cases, but it will narrow amount of ugly textures.

I'll try to prepare some examples later today. 

That making color/brightness adjustments in Gimp etc. And then pasting it into Wally works best. You have to actually right click then click paste in Wally tho. It's...ancient.

Wonder why the engines, compilers, etc keep getting modified and love but we are stuck with ancient buggy tools for textures. 

I'd prefer to be able to work 100 % in photoshop. It would be cool if someone knew how to take these tools over as extensions to PS and I assume GIMP can do something similar. 

Did you check the chasmtest wad? Maybe that could enlighten the case? This is what happens acording the two different pal files.

Here are my latest fan drivers.
The last one is so fast the gif file causes the so called wharfdale effect.

stand
walk
run 

You making shit up Madfox, don't you? 

the wagon wheel effect is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation.

If I made shit up, I hope it is blown away. 

you are good to go sir. Shit is blown all over here.
The rotaters look niece.