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# volumeLightCmd.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
    //
    // Use of this software is subject to the terms of the Autodesk
    // license agreement provided at the time of installation or download,
    // or which otherwise accompanies this software in either electronic
    // or hard copy form.
    // ==========================================================================
    //+

    #include <math.h>

    #include <maya/MIOStream.h>
    #include <maya/MSimple.h>
    #include <maya/MFnNurbsCurve.h>
    #include <maya/MPointArray.h>
    #include <maya/MDoubleArray.h>
    #include <maya/MPoint.h>

    #include <maya/MRampAttribute.h>
    #include <maya/MFnVolumeLight.h>
    #include <maya/MFloatArray.h>
    #include <maya/MIntArray.h>
    #include <maya/MColorArray.h>
    #include <maya/MColor.h>

    DeclareSimpleCommand( volumeLight, PLUGIN_COMPANY, "5.0");
    #define EQUAL(a,b) ( (((a-b) > -0.00001) && ((a-b) < 0.00001)) ? 1 : 0 )

    MStatus volumeLight::doIt( const MArgList& args )
    {
        MStatus stat;

        double arc = 180.0f;
        double coneEndRadius = 0.0f;
        MFnVolumeLight::MLightDirection volumeLightDirection = MFnVolumeLight::kOutward;
        MFnVolumeLight::MLightShape lightShape = MFnVolumeLight::kConeVolume;
        bool emitAmbient = true;

        unsigned    i;

        // Parse the arguments.
        for ( i = 0; i < args.length(); i++ )
        {
            if ( MString( "-a" ) == args.asString( i, &stat )
                    && MS::kSuccess == stat)
            {
                double tmp = args.asDouble( ++i, &stat );
                if ( MS::kSuccess == stat )
                    arc = tmp;
            }
            else if ( MString( "-c" ) == args.asString( i, &stat )
                    && MS::kSuccess == stat)
            {
                double tmp = args.asDouble( ++i, &stat );
                if ( MS::kSuccess == stat )
                    coneEndRadius = tmp;
            }
            else if ( MString( "-e" ) == args.asString( i, &stat )
                    && MS::kSuccess == stat)
            {
                bool tmp = args.asBool( ++i, &stat );
                if ( MS::kSuccess == stat )
                    emitAmbient = tmp;
            }

        }

        MFnVolumeLight light;

        light.create( true, &stat);

        cout<<"What's up?";

        if ( MS::kSuccess != stat )
        {
            cout<<"Error creating light."<<endl;
            return stat;
        }

        stat = light.setArc ((float)arc);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error setting \"arc\" attribute."<<endl;
            return stat;
        }

        stat = light.setVolumeLightDirection (volumeLightDirection);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error setting \"volumeLightDirection\" attribute."<<endl;
            return stat;
        }

        stat = light.setConeEndRadius ((float)coneEndRadius);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error setting \"coneEndRadius\" attribute."<<endl;
            return stat;
        }

        stat = light.setEmitAmbient (emitAmbient);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error setting \"emitAmbient\" attribute."<<endl;
            return stat;
        }

        stat = light.setLightShape (lightShape);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error setting \"lightShape\" attribute."<<endl;
            return stat;
        }

        double arcGet = light.arc (&stat);
        if ( MS::kSuccess != stat || arcGet != arc)
        {
            cout<<"Error getting \"arc\" attribute."<<endl;
            return stat;
        }

        MFnVolumeLight::MLightDirection volumeLightDirectionGet = light.volumeLightDirection (&stat);
        if ( MS::kSuccess != stat || volumeLightDirectionGet != volumeLightDirection)
        {
            cout<<"Error getting \"volumeLightDirection\" attribute."<<endl;
            return stat;
        }

        double coneEndRadiusGet = light.coneEndRadius (&stat);
        if ( MS::kSuccess != stat || coneEndRadiusGet != coneEndRadius)
        {
            cout<<"Error getting \"coneEndRadius\" attribute."<<endl;
            return stat;
        }

        bool emitAmbientGet = light.emitAmbient (&stat);
        if ( MS::kSuccess != stat || emitAmbientGet != emitAmbient)
        {
            cout<<"Error getting \"emitAmbient\" attribute."<<endl;
            return stat;
        }

        MFnVolumeLight::MLightShape lightShapeGet = light.lightShape (&stat);
        if ( MS::kSuccess != stat || lightShapeGet != lightShape)
        {
            cout<<"Error getting \"lightShape\" attribute."<<endl;
            return stat;
        }

        // Get reference to the penumbra ramp.
        MRampAttribute ramp = light.penumbraRamp (&stat);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error getting \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        MFloatArray a, b;
        MIntArray c,d;

        // Get the entries in the ramp
        ramp.getEntries (d, a, b, c, &stat);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error getting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // There should be 2 entries by default.
        if (d.length() != 2)
        {
            cout<<"Invalid number of entries in \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        MFloatArray a1, b1;
        MIntArray c1;

        // Prepare an array of entries to add.
        // In this case we are just adding 1 more entry
        // at position 0.5 with a curve value of 0.25 and a linear interpolation.
        a1.append (0.5f);
        b1.append (0.25f);
        c1.append (MRampAttribute::kLinear);

        // Add it to the curve ramp
        ramp.addEntries (a1, b1, c1, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error adding entries to \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // Get the entries to make sure that the above add actually worked.
        MFloatArray a2, b2;
        MIntArray c2,d2;
        ramp.getEntries (d2, a2, b2, c2, &stat);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error getting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        if ( a.length() + a1.length() != a2.length())
        {
            cout<<"Invalid number of entries in \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // Now try to interpolate the value at a point
        float newVal = -1;
        ramp.getValueAtPosition(.3f, newVal, &stat);

        if ( MS::kSuccess != stat )
        {
            cout<<"Error interpolating value from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        if ( !EQUAL(newVal, .15f))
        {
            cout<<"Invalid interpolation in  \"penumbraRamp\" expected .15 got "<<newVal
                <<" ."<<endl;
        }

        // Try to delete an entry in an incorrect manner.
        // This delete will work because there is an entry at 0,
        // However we should never do it this way, because the entries
        // array can become sparse, so trying to delete an entry without
        // checking whether an entry exists at that index can cause a failure.
        MIntArray entriesToDelete;
        entriesToDelete.append (0);
        ramp.deleteEntries (entriesToDelete, &stat);
        if ( MS::kSuccess != stat )
        {
            cout<<"Error deleting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // Check to see whether the above delete worked.
        // As mentioned earlier it did work, but we shouldn't do it this way.
        // To illustrate why we shouldn't do it this way, we'll try to delete
        // entry at index 0 ( this no longer exists)
        ramp.getEntries (d2, a2, b2, c2, &stat);

        if ( a2.length() != 2)
        {
            cout<<"Invalid number of entries in \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        // Trying to delete entry at 0.
        entriesToDelete.clear();
        entriesToDelete.append (0);
        ramp.deleteEntries (entriesToDelete, &stat);

        // It will fail because no entry exists.
        if ( MS::kSuccess == stat)
        {
            cout<<"Error deleting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        if ( a2.length() != 2)
        {
            cout<<"Invalid number of entries in \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // The proper way to delete is to retrieve the index by calling "getEntries"
        ramp.getEntries (d2, a2, b2, c2, &stat);
        entriesToDelete.clear();
        entriesToDelete.append (d2[0]);

        // Delete the first logical entry in the entry array.
        ramp.deleteEntries (entriesToDelete, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error deleting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        // There should be only 1 entry left.
        ramp.getEntries (d2, a2, b2, c2, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error getting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        entriesToDelete.clear();
        entriesToDelete.append (d2[0]);

        // Can't delete the last entry, should return failure.
        ramp.deleteEntries (entriesToDelete, &stat);
        if ( MS::kSuccess == stat)
        {
            cout<<"Error deleting entries from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }

        ramp.setPositionAtIndex (0.0f, d2[0], &stat);
        if ( MS::kSuccess != stat)
        {
            printf("Error setting position at index: %d, of \"penumbraRamp\" attribute.\n", d2[0]);
            return stat;
        }

        ramp.setValueAtIndex (1.0f, d2[0], &stat);
        if ( MS::kSuccess != stat)
        {
            printf("Error setting value at index: %d, of \"penumbraRamp\" attribute.\n", d2[0]);
            return stat;
        }

        ramp.setInterpolationAtIndex (MRampAttribute::kNone, d2[0], &stat);
        if ( MS::kSuccess != stat)
        {
            printf("Error setting interpolation at index: %d, of \"penumbraRamp\" attribute.\n", d2[0]);
            return stat;
        }

        MRampAttribute ramp2 = light.colorRamp (&stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error getting  \"colorRamp\" attribute."<<endl;
            return stat;
        }
        MFloatArray a3;
        MColorArray b3;
        MIntArray c3,d3;

        // Get the entries in the ramp
        ramp2.getEntries (d3, a3, b3, c3, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error getting entries from \"colorRamp\" attribute."<<endl;
            return stat;
        }
        // There should be 2 entries by default.
        if ( d3.length() != 2)
        {
            cout<<"Invalid number of entries in \"colorRamp\" attribute."<<endl;
            return stat;
        }

        MFloatArray a4;
        MColorArray b4;
        MIntArray c4;

        // Prepare an array of entries to add.
        // In this case we are just adding 1 more entry
        // at position 0.5 withe curve value of 0.5 and a linear interpolation.
        a4.append (0.5f);
        b4.append (MColor (0.0f, 0.0f, 0.75f));
        c4.append (MRampAttribute::kLinear);

        // Add it to the curve ramp
        ramp2.addEntries (a4, b4, c4, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error adding entries to \"colorRamp\" attribute."<<endl;
            return stat;
        }
        // Get the entries to make sure that the above add actually worked.
        MFloatArray a5;
        MColorArray b5;
        MIntArray c5,d5;
        ramp2.getEntries (d5, a5, b5, c5, &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error getting entries from \"colorRamp\" attribute."<<endl;
            return stat;
        }
        if (  a3.length() + a4.length() != a5.length())
        {
            cout<<"Invalid number of entries in \"colorRamp\" attribute."<<endl;
            return stat;
        }

        // Now try to interpolate the color at a point
        MColor newCol(0.0, 0.0, 0.0);
        ramp2.getColorAtPosition(.3f, newCol, &stat);

        if ( MS::kSuccess != stat )
        {
            cout<<"Error interpolating color from \"penumbraRamp\" attribute."<<endl;
            return stat;
        }
        if ( !EQUAL(newCol[2], .45))
        {
            cout<<"Invalid color interpolation in  \"colorRamp\" expected .45 got "<<newCol[2]<<endl;
        }

        MColor clr (0.5, 0.5, 0.0);
        ramp2.setColorAtIndex (clr, d5[0], &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error setting color at index: "<<d5[0]
                <<", of \"colorRamp\" attribute."<<endl;
            return stat;
        }

        ramp2.setInterpolationAtIndex (MRampAttribute::kSpline, d5[1], &stat);
        if ( MS::kSuccess != stat)
        {
            cout<<"Error setting interpolation at index: "<<d5[1]
                <<", of \"colorRamp\" attribute."<<endl;
            return stat;
        }

        return stat;
    }