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Special: Collision makes disappear the object

18 January 2015 04:00 #1102
Hello,

I recently upgraded to Blender 2.72 and Blend4Web 14.12 and I am facing a problem I have never met before.

I made a very simple scene, a plane for the ground and a cube. And for the code I copied and simplified the one from "making_a_game_p1-3".

Following the manual for the physics engine, the plane is static and its material has "Special: Collision" enabled. The cube is set to rigid body.

When I open it in Firefox, the ground has disappeared however the cube which was somehow in the air falls as expected and is stopped by the ground.

So it works as expected physically speaking but visually the ground is invisible. If I disable "Special: Collision" the ground is viewable but of course the cube falls through it. Any hint ?

I can pack you the whole repository if needed.
http://www.JPfeP.net
18 January 2015 09:03 #1104
Hi,

Collision materials are invisible. Well, it may look counter-intuitive, since objects with physics are visible. So you need to make a copy of your ground plane and assign a generic non-collision material to it.
Development Lead | Twitter
20 January 2015 02:40 #1113
It is indeed a little puzzling, specially from a BGE user perspective. I would like to understand.

This is a "recent" requirement to force a static object to have an explicit collision material to be taken in account by the physics system, isn't it ? I have another B4W project made with Blender 2.70 and version 14.05 of the SDK and I had not the need to set "Special: Collision" for the ground material, the objects were yet able to rebound on it.

What is the reason for this change, and why not let the exporter create automatically this copied object for instance ?
http://www.JPfeP.net
20 January 2015 10:24 #1117
Hi,

Static collisions are really a subject to debate and recently we have made a decision to move to a Blender-like system when you don't need to copy original mesh and define special-collision material. So you can expect such a behavior in February with Blend4Web 15.02 release.
I have another B4W project made with Blender 2.70 and version 14.05 of the SDK and I had not the need to set "Special: Collision" for the ground material, the objects were yet able to rebound on it
Probably there was some kind of bug or a hidden material as we haven't been changing this behavior from the first release.
Blend4Web developer
21 January 2015 10:31 #1127
This feature appeared to be more easy to realize. Thus it will appear in Blend4Web 15.01 next week.
Blend4Web developer
 
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