Video as a diffuse map

[powerspeed_de]

how to make an animated map of the diffuse material to mesh_base?

how to use video or image sequence for static or skined mesh?

[powerspeed_de]

:ph34r:

[ulf.schroeter]

Read the documentation: there is no mesh_material/mesh_skinned_material with video support. Video playback is only supported by WidgetSpriteVideo GUI element. There is also a UNIGINE sample for draping GUI on a mesh, maybe these 2 elements can be used somehow for achieving your desired effect. Otherwise I think you will have to implement it on your own with WidgetSpriteVideo as a blueprint (assuming you have source code access)

[powerspeed_de]

it's complicated, it would be easier if we could have a sequence of images (((

[ulf.schroeter]

Than create a new mesh material with 3D texture support for storing multiple diffuse (normal,specular) texure "slices" and a new parameter for texture slice selection. Of course a 3D texture will can only support a limited number of slices due to high memory consumption.

[frustum]

Create 2d atlas of frames. You can pack 256 different frames with 256x256 size in the single 4096x4096 texture. And set texture transformation which will switch frames: { int f = int(engine.game.getTime() * 4.0f); return vec4(1.0f/16.0f,1.0f/16.0f,(f%16)/16.0f,(f/16)/16.0f); }

[powerspeed_de]

oh! that's interesting, thanks, will try to

[danni.coy]

Create 2d atlas of frames. You can pack 256 different frames with 256x256 size in the single 4096x4096 texture. And set texture transformation which will switch frames: { int f = int(engine.game.getTime() * 4.0f); return vec4(1.0f/16.0f,1.0f/16.0f,(f%16)/16.0f,(f/16)/16.0f); }

 

cool - would it be possible to use something like this to calculate rolling tyres?

[ulf.schroeter]

In principal for sure but for low rotation rates I would expect some visible jumps between different atlas tyre frames (if you want to simulate tyre rotation without rotation of tyre geometry). Nevertheless a combination of tyre geometry rotation and speed-dependent texture frame selection of pre-motion-blurred tyre texture (with maybe 3-5 discrete rotation speed variants) can be used to avoid unwanted stroboscope-effects at higher rotation rates.

[danni.coy]

what about a combination of atlasing and rotating the texture coordinates

[ulf.schroeter]

Also possible. Regardless of actual approach increase of draw call count / posibble decrease of performance should be kept in mind as each per-instance modification of material parameters (e.g. texture parameters) will cause creation of an inherited material instance breaking engine instancing possibilities.

[danni.coy]

as it turns out we tend to have a lot of vehicles travelling at the same speed and at a constant speed but I will have to figure out how to make that work using instances