Read color file and apply to Transparency

[kamerosoul1]

Hi:

I am new in MEL programming.

I need a MEL script to connect a selected object color attribute and apply to the same object to transparency attribute.

It may have this format or other if proposed:

connectAttr -f file1_png.outTransparency file1obj.transparency;

where file1_png is the selected color file and file1obj is the selected object file

I tried to read selected data as next:

//Select an object first
string $mySel[] = `ls -sl`;
if (size($mySel) == 0) {
$msgbox = `confirmDialog -title "Error"
-message "Please select the objects that need apply transparency!"
-button "Ok"`;
}
string $shapes[] = ls("-sl", "-o", "-dag", "-s");
string $myMaterial[] = `listConnections -type "shadingEngine" $shapes`;

for ($items in $myMaterial)
{
string $surfaceShader[0] = `listConnections ($items + ".surfaceShader")`;
print ($surfaceShader[0]);
string $A = ($surfaceShader[0]);
}

But I do not know where and how apply connectAttr command

I hope anyone can help me

Thanks

[howard.cohl]

Hi there. I'm not sure if this helps, but I am doing something similar. For instance for a green surface, so do the following commands and they seem to work:

file -import -type "OBJ" -ns "den1" "/Users/hcohl/maya/myOBJfiles/den1.obj";/

select -r den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyAverageVertex -i 10 -ch 1 den1:Mesh;
polyCloseBorder -ch 1 den1:Mesh;
polySoftEdge  -a 30 -ch 1 den1:Mesh;


// Innermost Green surface
select -cl;
select -r den1:Mesh;
shadingNode -asShader blinn -name "surface1";
sets -renderable true -noSurfaceShader true -empty -name "surface1SG";
connectAttr -f "surface1.outColor" "surface1SG.surfaceShader";
sets -edit -forceElement "surface1SG" |den1:Mesh;
setAttr "surface1.color" -type double3 0.392 1.608 0.392;
setAttr "surface1.ambientColor" -type double3 0.133 0.133 0.133;
setAttr "surface1.transparency" -type double3 0.604 0.604 0.604;

[kamerosoul1]

Thank you sir for sharing your code. I will try to use it to fix my problem

[mcw0 · Accepted solution]

You're almost there.  Everything looks right.  After you get your surfaceShader, you can use listConnections to get the image file connected to the color channel.  Then use connectAttr to connect that result to your transparency.

[kamerosoul1]

Thank you very much  @mcw0

Now it is fixed

The missing part was next:

string $SSB[0] = `listConnections ($A + ".color")`;

string $B = ($SSB[0]);

connectAttr -f ($B + ".outTransparency") ($A + ".transparency");