Calculation of draw calls

[Ahiru]

I have a simple scene: http://playground.babylonjs.com/#CTHIE#4

Should there not be only ONE draw call and ONE material? Why there are 3 respectively 2 of them?

[jerome]

1 draw call only for me and 3 materials here

[Ahiru]

[Ahiru]

My problem is that I have several of these boxes in one scene, and they always cause 3 draws per box - that adds up fast.

 

And meshing them did not work either, because they are not rendered, then.

[gryff]

Ahiru, I got the same result as Jerome.

 

cheers, gryff

[JCPalmer]

I get 1 draw & 3 materials, using Firefox 40.  Notice that you are pushing 78k vertices.  Which exporter are you using?

[Ahiru]

*blush* - wrong link in clipboard. 

 

Edited!

[adam]

The href is still pointing to the original link.  Here:

 

http://www.babylonjs-playground.com/#CTHIE#4

[adam]

Looks like "show bounding box" requires 2 draw calls per mesh.

[Ahiru]

Hmm - is there a better way just to show the edges like a wireframe?

[GameMonetize]

you can set material.wireframe = true:

http://www.babylonjs-playground.com/#CTHIE#5

[Ahiru]

I tried already before (was my first idea) - but nothing is shown: http://www.babylonjs-playground.com/#CTHIE#6

 

Your example uses "CreateBox" again, ignoring, that I only have the min and max Verticex to create the box. (I know - I could write a function that calculates from there the center and scaling-factors and create a box and scale and move it around - and use the RenderEdges function in the end, because the wireframe splits the faces of the cube, wich is not intended)

 

But I liked it to see that there seemed an easy way to build a box with 2 Vertices only: - only the 3 draw calls for the bounding box are irritating and makes it slow in the end

var min_coordinates = new BABYLON.Vector3(-4, -10, -2);var max_coordinates = new BABYLON.Vector3(20, 1, 10);var custombb_mesh = new BABYLON.Mesh("custom_boundingbox", scene);var vertexdata = new BABYLON.VertexData();vertexdata.indices = [];vertexdata.positions = [	min_coordinates.x, min_coordinates.y, min_coordinates.z,	max_coordinates.x, max_coordinates.y, max_coordinates.z];vertexdata.applyToMesh(custombb_mesh);custombb_mesh.showBoundingBox = true;

[Ahiru]

By the way DK - you asked for wishes for the next version:

 

How about: BABYLON.BoundingBox.Show() ?

 

I use it for debugging reasons to visualise my bounding - boxes.

[GameMonetize]

what do you mean by show? you can enable mesh.showBoundingBox = true

[Ahiru]

Yes - that's when a mesh exists, that has a BoundingBox - what about manual created boundingBoxes like I would use to visualise the bounding boxes of an Octree?

[Ahiru]

Concrete (please don't look too close at the code - not ready yet ): http://playground.babylonjs.com/#URBLI#31

But every box will take 3!! draw-calls making it unusable for bigger Tree-Visualisations

[GameMonetize]

I reduced it thanks to some optims

http://playground.babylonjs.com/#URBLI#32

[Ahiru]

Hey - thanks - works well!