Away3D Forum Large poly mesh

smudgeface, Newbie
Posted: 06 September 2012 10:43 PM Total Posts: 2

I am beginning a fairly large project based on stage3d and I am evaluating various 3d engines to determine if they will be applicable for my application. What we are intending on creating is a 3d visualizer for a high-density height-map. High-density meaning >1M vertices. I am aware of stage3d’s limitations of 65k vertices per vertexBuffer and I am wondering:
“Does away3d support multi-buffer meshes?”
The way I imagine this working is that when a mesh is created which can not be fully contained in a single vertex buffer, additional buffers are created. The renderer would also need to support this, passing each of the vertex buffers to the shader program sequentially. I am delving into the depths of the source for an answer but any opinions and info on this would be appreciated.

Thanks!

Fabrice Closier, Administrator
Posted: 07 September 2012 08:24 AM Total Posts: 1265 [ # 1 ]

“Does away3d support multi-buffer meshes?”
yes, this is pretty much the default behaviour all over the API.

smudgeface, Newbie
Posted: 07 September 2012 09:42 AM Total Posts: 2 [ # 2 ]

Yea, I have looked around a bit and see that the raw vertices are actually contained in the SubGeometry class, but it doesn’t appear to support what I am talking about. The magic I am expecting to see would look something like

vertexBuffers.length = 0;
var index:uint = 0;
var tempBuff:VertexBuffer3D;
var numVerts:unit = vertices.length / DATA_PER;
while(numVerts - index > 0){
    if(numVerts - index > MAX_VERT_CNT){
        tempBuff = context.createVertexBuffer(MAX_VERT_CNT, DATA_PER);
        tempBuff.uploadFromVector(vertices, index, MAX_VERT_CNT);
        vertexBuffers.push(tempBuff);
        index += MAX_VERT_CNT;
    }else{
        tempBuff = context.createVertexBuffer(numVerts - index, DATA_PER);
        tempBuff.uploadFromVector(vertices, index, numVerts - index);
        vertexBuffers.push(tempBuff);
        index += numVerts - index;
    }
} 

All hope is not lost for me, however. Since the Geometry class contains many SubGeometries, I can segment my data and store each piece in it’s own SubGeometry - I will have to manage the vertex segmentation myself. Doable, but a bit of a PITA.

Is this what you meant by “this is pretty much the default behaviour all over the API”?

Fabrice Closier, Administrator
Posted: 07 September 2012 11:28 AM Total Posts: 1265 [ # 3 ]

Take a look at Merge class.

Large poly mesh Software: Away3D 4.x

smudgeface, Newbie Posted: 06 September 2012 10:43 PM Total Posts: 2 I am beginning a fairly large project based on stage3d and I am evaluating various 3d engines to determine if they will be applicable for my application. What we are intending on creating is a 3d visualizer for a high-density height-map. High-density meaning >1M vertices. I am aware of stage3d’s limitations of 65k vertices per vertexBuffer and I am wondering: “Does away3d support multi-buffer meshes?” The way I imagine this working is that when a mesh is created which can not be fully contained in a single vertex buffer, additional buffers are created. The renderer would also need to support this, passing each of the vertex buffers to the shader program sequentially. I am delving into the depths of the source for an answer but any opinions and info on this would be appreciated. Thanks!
Fabrice Closier, Administrator Posted: 07 September 2012 08:24 AM Total Posts: 1265 [ # 1 ] “Does away3d support multi-buffer meshes?” yes, this is pretty much the default behaviour all over the API.
smudgeface, Newbie Posted: 07 September 2012 09:42 AM Total Posts: 2 [ # 2 ] Yea, I have looked around a bit and see that the raw vertices are actually contained in the SubGeometry class, but it doesn’t appear to support what I am talking about. The magic I am expecting to see would look something like vertexBuffers.length = 0; var index:uint = 0; var tempBuff:VertexBuffer3D; var numVerts:unit = vertices.length / DATA_PER; while(numVerts - index > 0){ if(numVerts - index > MAX_VERT_CNT){ tempBuff = context.createVertexBuffer(MAX_VERT_CNT, DATA_PER); tempBuff.uploadFromVector(vertices, index, MAX_VERT_CNT); vertexBuffers.push(tempBuff); index += MAX_VERT_CNT; }else{ tempBuff = context.createVertexBuffer(numVerts - index, DATA_PER); tempBuff.uploadFromVector(vertices, index, numVerts - index); vertexBuffers.push(tempBuff); index += numVerts - index; } } All hope is not lost for me, however. Since the Geometry class contains many SubGeometries, I can segment my data and store each piece in it’s own SubGeometry - I will have to manage the vertex segmentation myself. Doable, but a bit of a PITA. Is this what you meant by “this is pretty much the default behaviour all over the API”?
Fabrice Closier, Administrator Posted: 07 September 2012 11:28 AM Total Posts: 1265 [ # 3 ] Take a look at Merge class.

Large poly mesh

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