Archive for the ‘ 3D ’ Category

Introducing myself to Mocaps

I landed on a host of tutorials on Motion capture (aka Mocaps).  It all  starts with these free motion captures files from the AACAD (Ohio State U.), then you take MakeHuman, a free tool for making realistic figures for rigging, then the rigging per say in Blender adding the Mocap animation data on top of it.  Finally, importing mesh and animation into UE4.  I’m still learning but I do believe my brain grew a millimetre today. 🙂

Creating a character in MakeHuman.
Rigging and animating the character with Mocap data.
Importing and animating in UE4.

We are Wilber, prepare to be assimilated …

The picture below must look strange to you: A poor sod being looked upon a group of billboard-carrying Wilber aficionados.

So many Wilbers ...

Like all tutorials gone wild, I had some fun improvising on the Blueprint tutorials from the Unreal Team. The example here is focused on mass-producing a series of attributes and behaviour into one object – a Blueprint – and then drop as many as I want into the scene.

So here we see the famous UE4 Blue Man in idle position.  Around him is a capsule that prevents the player to go through him and an additional box that is used as a trigger when my player enters his “personal space”.  Once in it, I can then use some key to trigger an interaction between me and the character.

Blue Man, capsule, trigger and billboard.

The ‘Wilber’ (the GIMP’s mascot) on top of the head was a funny thing.  It’s my first try in billboards and I’m currently using the one that’s built-in the characters blueprint.  I originally wanted to write names and professions over each character’s head when I figured that dealing fonts and transparencies isn’t that easy. So I went with something simpler, like having this iconic mascot with transparent contours. I happy with the “always-facing” part but it needs to be less geographically located on the Z axis (or whatever axis that may be since UE4 uses Z for “up”).

I still have issues with it.  Unreal fails to load a 32-bits PNG file with transparency into the asset editor directly.  So I got the simple DirectX texture tool, loaded the PNG into it then saved it as a A8R8G8B8 format.  When I load it, the texture is now considered as a DXT5 file but it still kept it’s alpha channel.  I finally got transparency when I took the alpha channel and connected it to the opacity property with a translucent blend mode.  I’m not sure if this is the best way but it will suffice for the moment.

Billboard transparency setup



Just playing around with GL_LINES and shaders.  On a previous post, I got acquainted with glDrawArraysInstanced() but this time, I built a more solid environment around it, with colour, rotation and scaling options for each object.  So far, its actually pretty good for prototyping with primitives.  Now, I just need a better editor than just write code directly into the source. 🙂lines-thumb


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