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why is my cast to blueprint failing?

Hi, I'm new to UE4 so I'm not sure if what i am doing is correct. I have created a desert style map with a day/night cycle. I wish to make it so that it is too cold to stay outside in the middle of the night and the player must be near fire.

I am using a blueprint 'simple sky' to control the 'sky spheres' sun position. i am then casting from 'simple sky' to the 'sky sphere' to get the sun height value. when the height value is below -0.6 a new variable 'temp cold' starts to count down from 30. ( works fine)alt text

I have then set up a box trigger around the fire. when the player overlaps the box trigger i want to cast to the 'simple sky' (from level blueprint) and set the 'temp cold' back to 30 but the cast is failing. i think it might be the casts object input causing the problem but I'm not sure what i need to connect it to or even if that is the problem.

alt text

Any help would be greatly appreciated!!


Product Version: UE 4.7
simplesky.png (138.9 kB)
level blueprint.png (107.0 kB)
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asked Oct 27 '15 at 02:16 PM in Blueprint Scripting

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Hi Soundguy,

Your cast is failing because currently you are not checking any variable to cast. It is reading a NULL value, so effectively your cast reads:

"Cast NULL to Simple_Sky", which will always fail because there is nothing for it to test. Add in a reference to your simple_sky to the input pin of your cast node.

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answered Oct 27 '15 at 02:32 PM

avatar image Soundguy Oct 27 '15 at 09:47 PM

Problem solved! Thanks for your help and such a quick response!

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