Hey everyone,
I'm currently using the OpenMayaRender.MPxSubSceneOverride to visualize
some custom data in the viewport.
In the simplest terms what I'm looking for is to create a point cloud, with
each point having a unique color. Kind of like rgbPP on particles.
What I want to do is create 1 MRenderItem, fill the vertex buffer with all
my point positions. And then via one of the ShaderManger stock shaders
assign some unique colors to each of the points.
I thought the "k3dCPVFatPointShader" would be the answer to my issue but it
doesn't seem to work. The color of all my points stay the stock color of
blue.
I feel like what I'm attempting to do is really simple, I'm just missing
something. Anyone ever have any luck assigning colors to points that exist
within the same render item? Is it possible using the stock shaders?
Here's what I have at the moment:
vboPosDesc = OpenMayaRender.MVertexBufferDescriptor("", OpenMayaRender.
MGeometry.kPosition, OpenMayaRender.MGeometry.kFloat, 3)
vboColorDesc = OpenMayaRender.MVertexBufferDescriptor("color",
OpenMayaRender.MGeometry.kColor, OpenMayaRender.MGeometry.kFloat, 3)
def createPointCloud(self, container):
shader = self.shaderMgr.getStockShader(OpenMayaRender.MShaderManager.
k3dCPVFatPointShader)
positions = VBO_Pos.acquire(numPoints, True)
colors = VBO_Color.acquire(numPoints, True)
numPoints = 1000
VBO_Pos = OpenMayaRender.MVertexBuffer(vboPosDesc)
VBO_Color = OpenMayaRender.MVertexBuffer(vboColorDesc)
floatinc = sizeof(c_float)
pid = 0
for x in xrange(numPoints):
c_float.from_address(positions + (pid) * floatinc).value = random.
uniform(-500, 500)
c_float.from_address(positions + (pid+1) * floatinc).value = 0.0
c_float.from_address(positions + (pid+2) * floatinc).value = random.
uniform(-500, 500)
c_float.from_address(colors + (pid) * floatinc).value = random.
uniform(0,1)
c_float.from_address(colors + (pid+1) * floatinc).value = random.
uniform(0,1)
c_float.from_address(colors + (pid+2) * floatinc).value = random.
uniform(0,1)
pid+=3
VBO_Pos.commit(positions)
VBO_Color.commit(colors)
item = OpenMayaRender.MRenderItem.create("pointCloud", OpenMayaRender.
MRenderItem.DecorationItem, OpenMayaRender.MGeometry.kPoints)
item.setShader(shader)
container.add(item)
buffers = OpenMayaRender.MVertexBufferArray()
buffers.append(VBO_Color, "color")
buffers.append(VBO_Pos, "positions")
self.setGeometryForRenderItem(item, buffers, None, None)
self.shaderMgr.releaseShader(shader)
return item
P.S. I have successfully gotten what I want by creating a renderItem
containing 1 point, instancing that point to all the positions I want, then
overriding the "solidColor" attribute on the shader via the
"setExtraInstanceData" method. But that seems to run about 4-5 times slower
than having all the points within the same RenderItem
Thanks a lot in advance for any help on this :)
Cheers,
-Ryan
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