Havok Engine Animations

[SergeantJoe]

The Havok engine is fairly popular, and there are official tools for it. However, they only work for native Havok .hkx files.
The issue here is how to extract those out of games.

Here are some sample files, and an accompanying skeleton. They use Havok Engine "hkaSplineCompressedAnimation".

To my knowledge nobody has managed to extract .hkx files out of these. Would anyone be willing to take a look?

[MichaelDarkAngel]

I've looked at The Witcher 2 files and I've also looked at the havok files that the Assassin's Creed games use. I have yet to make anything out of either one.

From what I understand, the havok engine is very configurable which means that each developer that uses it could create a completely different file.

Makes it somewhat tougher to decipher the file.

-- MDA

[Bastien]

To visualize it in the havok tools, you also have to have an skeleton, and the correct version (could be above the version of the havok file, according to one test I did).

I took a quick look and the files doesn't seem to be compressed. The "real" havok file starts when you see this ID magic: 0x57E0E057.
The thing is it's in binary mode, and it's quite an old version (6.5). I mentioned in other post there's a tool for converting from binary to xml and/or KF files, to then be imported to 3ds max.
You could try creating a new file cutting the havok file and changing the version to the same as skyrim's (hkxcmd tool only reads those) "hk_2010.2.0-r1" and run hkxcmd. I don't think it will work though. I read the source in the past and is pretty big, didn't get much info on the format unfortunately.
https://github.com/figment/hkxcmd
http://www.youtube.com/watch?v=OoyP_SWaxnE

I've never made an importer with animations but I really want to do my first for havok, the only problem I didn't figure it out how to interpret the xml code yet (only a small part to match bone indices)
As soon as I find out, I could help you with this version.

Here's one sample xml havok animation, and also attached the binary equivalent in case someone could throw a hint.

Code: Select all

<?xml version="1.0" encoding="ascii"?>
<hkpackfile classversion="8" contentsversion="hk_2010.2.0-r1" toplevelobject="#0040">

	<hksection name="__data__">

		<hkobject name="#0043" class="hkaDefaultAnimatedReferenceFrame" signature="0x6d85e445">
			<!-- memSizeAndFlags SERIALIZE_IGNORED -->
			<!-- referenceCount SERIALIZE_IGNORED -->
			<hkparam name="up">(0.000000 1.000000 0.000000 0.000000)</hkparam>
			<hkparam name="forward">(0.000000 0.000000 1.000000 0.000000)</hkparam>
			<hkparam name="duration">1.066667</hkparam>
			<hkparam name="referenceFrameSamples" numelements="33">
				(0.000000 0.000000 0.000000 0.000977)
				(0.000001 0.000000 0.028074 0.000977)
				(0.000002 0.000000 0.136542 0.000977)
				(0.000003 0.000000 0.688910 0.000977)
				(0.000004 0.000000 1.291227 0.000977)
				(0.000006 0.000000 1.904401 0.000977)
				(0.000007 0.000000 2.182335 0.000977)
				(0.000008 0.000000 2.460175 0.000977)
				(0.000009 0.000000 2.737976 0.000977)
				(0.000010 0.000000 3.015785 0.000977)
				(0.000011 0.000000 3.293650 0.000977)
				(0.000012 0.000000 3.571601 0.000977)
				(0.000013 0.000000 3.849666 0.000977)
				(0.000014 0.000000 4.127872 0.000977)
				(0.000016 0.000000 4.406248 0.000977)
				(0.000017 0.000000 4.684819 0.000977)
				(0.000018 0.000000 4.963606 0.000977)
				(0.000018 0.000000 5.286085 0.000977)
				(0.000018 0.000000 5.602636 0.000977)
				(0.000018 0.000000 5.873286 0.000977)
				(0.000018 0.000000 6.080829 0.000977)
				(0.000018 0.000000 6.186240 0.000977)
				(0.000018 0.000000 6.214421 0.000977)
				(0.000018 0.000000 6.214398 0.000977)
				(0.000018 0.000000 6.213490 0.000977)
				(0.000018 -0.041430 6.211854 0.000977)
				(0.000020 -0.200448 6.209347 0.000977)
				(0.000023 -0.502627 6.206564 0.000977)
				(0.000027 -0.908922 6.203559 0.000977)
				(0.000031 -1.380289 6.200387 0.000977)
				(0.000034 -1.877685 6.197104 0.000977)
				(0.000037 -2.362068 6.193763 0.000977)
				(0.000037 -2.794391 6.190422 0.000977)
			</hkparam>
		</hkobject>

		<hkobject name="#0042" class="hkaSplineCompressedAnimation" signature="0x792ee0bb">
			<!-- memSizeAndFlags SERIALIZE_IGNORED -->
			<!-- referenceCount SERIALIZE_IGNORED -->
			<hkparam name="type">HK_SPLINE_COMPRESSED_ANIMATION</hkparam>
			<hkparam name="duration">1.066667</hkparam>
			<hkparam name="numberOfTransformTracks">30</hkparam>
			<hkparam name="numberOfFloatTracks">0</hkparam>
			<hkparam name="extractedMotion">#0043</hkparam>
			<hkparam name="annotationTracks" numelements="0"></hkparam>
			<hkparam name="numFrames">33</hkparam>
			<hkparam name="numBlocks">1</hkparam>
			<hkparam name="maxFramesPerBlock">256</hkparam>
			<hkparam name="maskAndQuantizationSize">120</hkparam>
			<hkparam name="blockDuration">8.500002</hkparam>
			<hkparam name="blockInverseDuration">0.117647</hkparam>
			<hkparam name="frameDuration">0.033333</hkparam>
			<hkparam name="blockOffsets" numelements="1">
				0
			</hkparam>
			<hkparam name="floatBlockOffsets" numelements="1">
				4744
			</hkparam>
			<hkparam name="transformOffsets" numelements="0"></hkparam>
			<hkparam name="floatOffsets" numelements="0"></hkparam>
			<hkparam name="data" numelements="4752">
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			</hkparam>
			<hkparam name="endian">0</hkparam>
		</hkobject>

		<hkobject name="#0041" class="hkaAnimationBinding" signature="0x66eac971">
			<!-- memSizeAndFlags SERIALIZE_IGNORED -->
			<!-- referenceCount SERIALIZE_IGNORED -->
			<hkparam name="originalSkeletonName">skel_root</hkparam>
			<hkparam name="animation">#0042</hkparam>
			<hkparam name="transformTrackToBoneIndices" numelements="30">
				0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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			</hkparam>
			<hkparam name="floatTrackToFloatSlotIndices" numelements="0"></hkparam>
			<hkparam name="blendHint">NORMAL</hkparam>
		</hkobject>

		<hkobject name="#0044" class="hkaAnimationContainer" signature="0x8dc20333">
			<!-- memSizeAndFlags SERIALIZE_IGNORED -->
			<!-- referenceCount SERIALIZE_IGNORED -->
			<hkparam name="skeletons" numelements="0"></hkparam>
			<hkparam name="animations" numelements="1">
				#0042
			</hkparam>
			<hkparam name="bindings" numelements="1">
				#0041
			</hkparam>
			<hkparam name="attachments" numelements="0"></hkparam>
			<hkparam name="skins" numelements="0"></hkparam>
		</hkobject>

		<hkobject name="#0040" class="hkRootLevelContainer" signature="0x2772c11e">
			<hkparam name="namedVariants" numelements="1">
				<hkobject>
					<hkparam name="name">Animation Container</hkparam>
					<hkparam name="className">hkaAnimationContainer</hkparam>
					<hkparam name="variant">#0044</hkparam>
				</hkobject>
			</hkparam>
		</hkobject>

	</hksection>

</hkpackfile>

[SergeantJoe]

You could try asking shakotay, he figured out how to convert them into a useable format.

He provided the W2 animations, and even included an example skeleton.

I have a Sleeping Dogs skeleton here but you'll have to ask him for the .hkx file, he's the only one that can extract them.

[freakshow]

so witcher 2 animations are really made into something usable?

[SergeantJoe]

I highly doubt it, but you'll have to wait for one of those fellows to answer.

[SergeantJoe]

Say Bastien, did you ever figure this out? I tried those Skyrim tools but I never was able to find a working download link. I doubt it would work anyway, these are hk_2011.2.0-r1 instead of 2010.

Also, I fixed the dead links in the first post. Now the download has two types of files: a few with a single hkx in them, and a couple with multiple hkx anims in them.
I don't know if there's a difference but I included them just in case.

I also added a skeleton. It's in Source SMD though, not sure how to convert it to hkx.

[SergeantJoe]

EDIT: Disregard my method. While it does in fact produce a .hkx file, it's broken to the point of uselessness.

[JohnHudeski]

Congrats on Getting that to work. I should have checked here first before making my thread
There is one difference in mine is that there are multiple animation files in one tmp

[SergeantJoe]

Congrats on Getting that to work. I should have checked here first before making my thread
There is one difference in mine is that there are multiple animation files in one tmp

But that's the thing, it doesn't work at all.

There multiple anims in mine too. Example, the first one starts at 28, the next at 17F8. And hkxcmd thinks it's all one large animation. It's clear that hkxcmd will not help in this case, we need a whole new program.
Just out of curiosity, are your files marked hk_2011.2.0-r1 as well? Maybe the formats are similar.

I saw you said you were a programmer. Would you be able to help with this? The only other person who showed the slightest bit of interest is Bastien and unfortunately it seems he's gone for good.

[JohnHudeski]

My files 4.6.0 R1 (Tenchu on the Wii)
But I have had a 2011 version before. Never worked with hkcmd so I had to use the havok sdk.

I converted it to my own custom format.

Where do you plan to use these animations? PM me I can show you what I did

[SergeantJoe]

EDIT: Nvm, I overreacted. Sorry about that.

In any case, this topic is still wide open. It shouldn't be that difficult, the format is practically the same as the 2010 version, only there's a small header and multiple animations per file.

[SergeantJoe]

Last time I talked to Bastien several months ago, he was incredibly busy but promised to take a look when he could. Haven't heard anything since.


However, with the release of Definitive Edition, the files have changed. They are now Havok 2013.

What this means I do know know, but from the looks of it they're the same format as the original 2011 files.

[SergeantJoe]

Found the SplineComprssedAnimations section!

Code: Select all

/* 26616 */
struct __cppobj __declspec(align(8)) hkaSplineCompressedAnimation : hkaAnimation
{
  int m_numFrames;
  int m_numBlocks;
  int m_maxFramesPerBlock;
  int m_maskAndQuantizationSize;
  float m_blockDuration;
  float m_blockInverseDuration;
  float m_frameDuration;
  hkArray<unsigned int,hkContainerHeapAllocator> m_blockOffsets;
  hkArray<unsigned int,hkContainerHeapAllocator> m_floatBlockOffsets;
  hkArray<unsigned int,hkContainerHeapAllocator> m_transformOffsets;
  hkArray<unsigned int,hkContainerHeapAllocator> m_floatOffsets;
  hkArray<unsigned char,hkContainerHeapAllocator> m_data;
  int m_endian;
};

There's apparently a ton of other animation types as well:

Code: Select all

/* 777 */
enum hkaAnimation::AnimationType
{
  HK_UNKNOWN_ANIMATION = 0x0,
  HK_INTERLEAVED_ANIMATION = 0x1,
  HK_MIRRORED_ANIMATION = 0x2,
  HK_SPLINE_COMPRESSED_ANIMATION = 0x3,
  HK_QUANTIZED_COMPRESSED_ANIMATION = 0x4,
  HK_PREDICTIVE_COMPRESSED_ANIMATION = 0x5,
  HK_REFERENCE_POSE_ANIMATION = 0x6,
};

[SergeantJoe]

Alright, I figured it out. BIN animation files are just a bunch of compressed HKX files in a row.

Each individual .hkx file starts with hex value 6499




and ends with this line.




Plus they're awfully similar to the 2011/2010 format.




Maybe we can try what Bastien said, simply cutting out that starting data, changing 2013 to 2010, and feeding it through hkxcmd.

I tried this already for 2011 version, but the reason it probably didn't work was because I was giving it the entire .bin file with all the hkx files combined. Maybe if I give it an isolated hkx file it'll work.