(solved) Collision box definition

[taikedz]

Hello

I am trying to find where collision_box is defined, and what its individual numbers represaent but cannot seem to see either in rubenwardy's guide nor on dev.minetest wiki any formal/detailed description....

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collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},

I tried changing them all to 1 or 2 on a test entity but the collision box remained the same.

What do the numbers mean...?

[qwertymine3]

The numbers define the two corners of the box that the player collides with. These are relative the to center of the entity. The center of the entity is the position you get if you call get_pos().

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collisionbox = { --[[first corner]] x,y,z, --[[second corner]] x,y,z}
collisionbox = { x,y,z,x2,y2,z2}

The sample you gave would produce a 1*1 meter collision box where the center of the entity is in the middle of the
collision box.

2D representations:

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0.5|0.5
+-----+
|     | 0.5
|  o  | -
|     | 0.5
+-----+

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+-----+ <(0.5,0.5)
|     |
|  o  |    o = center of entity
|     |
+-----+
^(-0.5,-0.5)

[taikedz]

The numbers define the two corners of the box that the player collides with. These are relative the to center of the entity. The center of the entity is the position you get if you call get_pos().

Great thanks - I am pretty sure the brief trials I did ddin't make a diference, but if your notes are indeed the case, then I should probably look harder!

EDIT -- it was due to a typo. Grr.

Cheers

[azekill_DIABLO]

i encounter the same issue. i can't change the collision box. "collisionbox = {-0.2,-0.4,-0.2, 0.2,0.35,0.2}," still gives me a basic 1*1*1 box.

[azekill_DIABLO]

oh sorry i found my error

'collsion_box' instead of 'collisionbox'

[ulla]

Hi where is the maximum collision_box dimension? example

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collision_box = {  
	       type = "fixed",
	        fixed = { -3.25,-0.5,-5.5, 3.25,-0.25,2.5  },
	     },

for walkable node
I make a bridge door mod for build castle but max i can collide is 4x4 block? or is my error?

[Krock]

I make a bridge door mod for build castle but max i can collide is 4x4 block? or is my error?

This is not your fault. Minetest does not support larger collision boxes because of performance reasons. Here's a reported glitch caused by a large collision box, and here the rejected pull request to fix this problem.

What you can do in this case is to register multiple nodes (or blocks, as you say them in-game) and limit them to a maximum of 3x3x3 meters span.

[v-rob]

3x3x3 doesn't always work either. It's best just to register nodes and have them be placed next to each other like the homedecor mod usually does.

[ulla]

I make a bridge door mod for build castle but max i can collide is 4x4 block? or is my error?

This is not your fault. Minetest does not support larger collision boxes because of performance reasons. Here's a reported glitch caused by a large collision box, and here the rejected pull request to fix this problem.

What you can do in this case is to register multiple nodes (or blocks, as you say them in-game) and limit them to a maximum of 3x3x3 meters span.

355/5000
Thanks for the reply, in fact I opted for 3x3, now I have to study swaps as nodes connected, considering that it is a bridge lift and makes 4 movements,
ps 3x3 works only if we start from the center, ie 1.5,0.25,1.5, -1,5,0,1,5 in my case and therefore the maximum possible collision extension for a cube is 1.5,1.5,1.5, -1.5, 0 , -1.5

[ulla]

3x3x3 doesn't always work either. It's best just to register nodes and have them be placed next to each other like the homedecor mod usually does.

thanks for the reply ps 3x3 works only if we start from the center,and therefore the maximum possible collision extension for a cube is 1.5,1.5,1.5, -1.5, 0 , -1.5 homedecor, has no objects larger than 3, it seems to me that the biggest is long sofa 3x1