Mesh generation in view clarification

[reginaldlouis]

In your documentation, you said

Do not generate meshes in view, read more about this here

I didn't see any way of the alternative. All your example call WebGL.toHtml that end up generating a mesh on the fly.

Did a miss something? Can you clarify what you mean by that? I supposed it's better to generate the mesh on a init function and store them the application state somehow?

Thx!

[RoganMurley]

@reginaldlouis Every mesh generated is cached and never freed, so generating a new mesh every render causes a memory leak. Instead generate a mesh at the top-level outside the view so that it is only cached once.

For example:

import Math.Vector2 exposing (vec2)
import Math.Vector3 exposing (vec3)
import WebGL

quad : WebGL.Mesh Vertex
quad =
    let
        topRight =
            { position = vec3 1 1 0, coord = vec2 0 1 }

        bottomRight =
            { position = vec3 1 -1 0, coord = vec2 0 0 }

        bottomLeft =
            { position = vec3 -1 -1 0, coord = vec2 1 0 }

        topLeft =
            { position = vec3 -1 1 0, coord = vec2 1 1 }
    in
        WebGL.triangles
            [ ( topLeft, topRight, bottomLeft )
            , ( bottomLeft, topRight, bottomRight )
            ]

[reginaldlouis]

Understood. Thx you!! On Mon, Oct 8, 2018 at 7:46 AM Rogan Murley notifications@github.com wrote:

@reginaldlouis https://github.com/reginaldlouis Every mesh generated is cached and never freed, so generating a new mesh every render causes a memory leak. Instead generate a mesh at the top-level outside the view so that it is only cached once.

For example:

import Math.Vector2 exposing (vec2) import Math.Vector3 exposing (vec3) import WebGL

quad : WebGL.Mesh Vertex quad = let topRight = { position = vec3 1 1 0, coord = vec2 0 1 }

    bottomRight =
        { position = vec3 1 -1 0, coord = vec2 0 0 }

    bottomLeft =
        { position = vec3 -1 -1 0, coord = vec2 1 0 }

    topLeft =
        { position = vec3 -1 1 0, coord = vec2 1 1 }
in
    WebGL.triangles
        [ ( topLeft, topRight, bottomLeft )
        , ( bottomLeft, topRight, bottomRight )
        ]

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[w0rm]

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