Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Unable to sample custom texture inside custom expression


I am unable to sample textures inside a "Custom" node. I get an error saying cannot implicitly convert 'Texture2D' to 'sampler2D'. I have attached a screenshot of my setup below.

My custom expression code:

 float4 myTexture = tex2D(In, Texcoord);
 return myTexture;

alt text

Product Version: Not Selected
capture.jpg (199.6 kB)
more ▼

asked May 30 '14 at 05:45 PM in Bug Reports

avatar image

617 23 29 47

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

3 answers: sort voted first

Hello HypnoticShark,

Unfortunately, You can't sample a texture from within a custom expression. This is a known limitation that we currently do not support. But, I have raised awareness about this issue and expect it to be fixed in a future release.


more ▼

answered Jun 02 '14 at 07:38 PM

avatar image HypnoticShark Jun 02 '14 at 09:12 PM

I see. Well I guess this documentation page needs to be updated in that case. https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/ExpressionReference/Custom/index.html


(comments are locked)
10|2000 characters needed characters left
Viewable by all users


I found a temporary solution as explained here : https://forums.unrealengine.com/showthread.php?405-HLSL-code-Texture2D-to-sampler2D

when analysing hlsl code, It seems that the CustomTexture node generate a Texture2D, but Custom node wait a sampler2D as argument function...

I would request a fix for custom node (and/or custom texture) and a real window to edit code instead of a single line text box.


more ▼

answered Jun 05 '14 at 09:09 PM

avatar image

16 2

avatar image HypnoticShark Jun 05 '14 at 09:29 PM

Thats awesome! thanks fredakilla and yes I agree with the real window to edit code thing.

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

It is officially supported since about 4.7:


(if your texture pin is named Tex)

References: http://oliverm-h.blogspot.sk/2014/12/ue4-quick-tip-sampling-textures-in.html https://answers.unrealengine.com/questions/455514/undeclared-identifier-texsampler.html

However it did not work for me, I had to use this:

  Tex.SampleLevel(TexSampler, UV, 0);

References: http://shaderbits.com/blog/uv-dilation

more ▼

answered May 03 '18 at 09:37 PM

avatar image

86 4 7 12

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question