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Whiteboard is not working :(

So I followed Reuben Ward's Tutorial on making a whiteboard, but instead of using a FPS, I used a sphere which is always at mouse location. So far so good... NOT! Because whenever I use it, there is only a circle in the middle of the whiteboard and I have absolutely no idea what I'm doing wrong! Here are some screenshots:

BP_Sphere: Sphere

BP_Whiteboard: Whiteboard

And this is how it looks: Preview

Thanks for any help in advance!

Product Version: UE 4.16
sphere.png (177.2 kB)
whiteboard.png (144.2 kB)
preview.png (91.1 kB)
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asked Mar 14 '18 at 05:24 PM in Blueprint Scripting

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2 answers: sort voted first

I think you may be missing a parameter name in BP_Whiteboard: when you set the Vector Parameter Value in the Marker Material Instance the parameter name is set to None, but probably should be set to DrawLocation or something like that.

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answered Mar 28 '18 at 05:52 PM

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avatar image Pixel_Error Mar 29 '18 at 04:38 PM

That... actually worked! And makes sense... Thanks PabloNajurieta, and also salm for your help! One last question: Do you think it's possible to draw a texture?

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Right after event 'Draw on WB' you multiply by scalar '0.0000'. If you breakpoint 'Set Vector Paramateter' you'll probably see it is always a zeroed vector. I haven't seen the tutorial, so I'm not sure what is actually supposed to go there.

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answered Mar 25 '18 at 01:07 PM

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avatar image Pixel_Error Mar 26 '18 at 02:31 PM

Unfortunatley, that didn't help... but still, thanks for your answer!

avatar image salm Mar 27 '18 at 05:11 PM

PrintString the 'Location To Draw' pin on 'Draw on WB' event. What does it return?

Also, Is 'UV from hit result' checked in Physics? The UV Collision node tooltip says you have to.

avatar image Pixel_Error Mar 28 '18 at 01:51 PM

Now I'm really confused... PrintString gives coordinates between 0 and 1, and yes, 'UV from hit result' is activated... Maybe it's the board itself? I used a cube

avatar image salm Apr 04 '18 at 04:50 PM

I was confusing the Vector2d to Vector conversion node with a multiplication node. They both are marked with '*', I think.

Anyway, nice catch, PabloNajurieta.

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