When you use a mograph python effector switched to "full control" mode by default it doesn't work because of the absence of a falloff field. It took me awhile to figure out why my custom effectors didn't work coming from R18 to R20.

I would suggested updating the boilerplate in the effector when switching to full control mode to check for a falloff if that's possible. If not maybe fall back to commented out version for with falloff and without?

Thanks so much @ferdinand! You all at Maxon are the best. Sorry my code is a shit show, just a quick hack at a rolling cube rig.

For anyone in the future looking for this solution here's what I needed:

    # Rolling
    distTraveled = pos - PREV_POS
    numRevs.x = (distTraveled.x / circumfrence.x)
    numRevs.z = (distTraveled.z / circumfrence.z)
    outRot = numRevs * c4d.utils.DegToRad(360.0)
    objMx = rotObj.GetMl()
    worldXInLocal = ~objMx * c4d.Vector(1, 0, 0)
    worldZInLocal = ~objMx * c4d.Vector(0, 0, 1)
    xTrans = c4d.utils.RotAxisToMatrix(worldXInLocal, -outRot.z)
    zTrans = c4d.utils.RotAxisToMatrix(worldZInLocal, outRot.x)
    rotObj.SetMl(objMx * xTrans * zTrans)

I needed the cube to be able to roll the correct way regardless of orientation. Admittedly this was a simple matrix transform issue that anyone who actually understood graphics programming would've known. (LOL not me)

Here's the full scene for anyone interested. test_cube_roll.c4d

Hello!

I'm having a hard time wrapping my brain around this script I'm trying to write.

I want to rotate a cube along the floor in the direction that it's being animated. The problem I'm running into is that I need to be able to specify the rotation around the world axis (just like how the rotate tool does) so that when the cube is oriented in any direction, I can still rotate properly with the animation.

Here's some pseudo code and a screen grab. Any help would be greatly appreciated!

# Rolling
distTraveled = pos - PREV_POS
numRevs.x = (distTraveled.x / circumfrence.x)
numRevs.z = (distTraveled.z / circumfrence.z)
outRot = numRevs * c4d.utils.DegToRad(360.0)
objMx = rotObj.GetMl()
rotMx = c4d.utils.MatrixRotY(-outRot.z) * c4d.utils.MatrixRotZ(outRot.x)
rotObj.SetMl(objMx * rotMx)

https://microsoft-my.sharepoint-df.com//p/cosorgen/ESTEQCvARE1Nn4F3qnKfCC8B1nahC5Y3iHhSvgOtkhO0DQ?e=xhrNCK

This code almost works, but some of the time the cube rotates the wrong direction (although on the right axis).

I was actually able to get what I need through GeClipMap's GetFontDescription().

Thanks!

Re: [python] SetFont not working

@m_adam Thank you so much for this example of setting the FontData of a MoText. Would you mind showing me where I can figure out what each ID is setting?

500: Font Family?
501: ?
502: Font Weight?
503: ?
509: Font family again?
508: Font postscript name?

Any help would be much appreciated!

Hey @m_adam thanks for getting back to me. I'm on R20.059.

Here's the default python effector when switched to full control. I haven't touched anything. As you can see it does nothing even though it's supposed to be lifting each clone up 100cm.

If you set the last parameter in the md.SetArray() function to False. It will work.

python_effector_demo_01.c4d

When you use a mograph python effector switched to "full control" mode by default it doesn't work because of the absence of a falloff field. It took me awhile to figure out why my custom effectors didn't work coming from R18 to R20.

I would suggested updating the boilerplate in the effector when switching to full control mode to check for a falloff if that's possible. If not maybe fall back to commented out version for with falloff and without?

@m_adam thanks so much for all your help on this!

@m_adam I'm finally getting around to implementing this fix, and it's working really well except for it's alway rebuilding the cache, GetAndCheckHeirarchyClone is always saying the input object is dirty.

Is this how it's supposed to work?

Thanks @r_gigante that's what I thought.

Hello,

What's the proper way to sample a shader (noise, gradient, etc.) in 3D space without a given VolumeData object?

I understand how to map the ChannelData's p (uvw) parameter to my object's uvw coordinates, but how do I sample in a way that works like Mograph's shader effector works?

When I sample a noise, and put my objects uvw coordinates in the ChannelData object, if I switch the noise to "World Space", that doesn't work obviously, cause i'm still sampling in texture space in the code. Do you have to manually check that parameter in the BaseShader object?

See simplified code:

BaseObject* GetVirtualObjects(BaseObject* op, HierarchyHelp* hh)
{
    GeData           myData;
    Bool             cacheDirty, dirty, frameUpdate;
    BaseObject       *outObject, *customShape;
    BaseShader       *shader;
    BaseDocument     *doc = hh->GetDocument();
    InitRenderStruct irs(doc);
    
    outObject = BaseObject::Alloc(Onull); // dummy output object
    
    cacheDirty = op->CheckCache(hh);
    dirty = op->IsDirty(DIRTYFLAGS_DATA | DIRTYFLAGS_MATRIX);
    
    op->GetParameter(DescLevel(FROMSHADER_FRAME_UPDATE), myData, DESCFLAGS_GET_0);
    frameUpdate = myData.GetBool();
    
    if (frameUpdate)
    {
        Int32 curFrame = doc->GetTime().GetFrame(doc->GetFps());
        if (curFrame != prevFrame){
            dirty = true;
            prevFrame = curFrame;
        }
    }
    
    if (!dirty && !cacheDirty)
    {
        blDelete(outObject);
        return op->GetCache();
    }
    
    op->GetParameter(DescLevel(FROMSHADER_SHADER), myData, DESCFLAGS_GET_0);
    shader = (BaseShader *)myData.GetLink(doc);
    
    if (!shader)
        goto error;
    
    StatusSetSpin();
    
    customShape = BaseObject::Alloc(Ocube);
    customShape->SetParameter(DescLevel(PRIM_CUBE_LEN), GeData(Vector(shapeSize)), DESCFLAGS_SET_0);
    customShape = MakeEditable(customShape, doc, true);
    
    if (!customShape)
        goto error;
    
    if (shader->InitRender(irs) != INITRENDERRESULT_OK)
        goto error;
    
    if (!helper->grid)
        return false;
    
    StatusSetText("Sampling Noise");
    
    Vector rad = customShape->GetRad();
    
    for ( ; iter; ++iter)
    {
        ChannelData cd;

        cd.off = 0;
        cd.scale = 0;
        cd.t = time;
        cd.texflag = CALC_TEXINFO(0, CHANNEL_COLOR);
        cd.d = Vector(1, 1, 1);
        cd.n = Vector(0, 1, 0);
        cd.vd = nullptr;
        Vector pos = iter.getPos();
        Vector worldPos = op->GetMg() * Vector(pos.x(), pos.y(), pos.z());
        Float min = 1 - ((rad.x + rad.y + rad.z) / 3);
        Float max = ((rad.x + rad.y + rad.z) / 3);
        cd.p = Vector((c4dPos.x - min) / (max - min),
                      (c4dPos.y - min) / (max - min),
                      (c4dPos.z - min) / (max - min));

        Vector col = shader->Sample(&cd);
        Float luma = 0.2126 * col.x + 0.7152 * col.y + 0.0722 * col.z; // calc luminence
        iter.setValue(luma);
    }
    
    shader->FreeRender();
    
    StatusClear();
    
    customShape->InsertUnder(outObject);
    
    return outObject;
    
error:
    blDelete(outObject);
    StatusClear();
    return nullptr;
}