Adding a transparent image in with textures

Support Materials and Textures
1

I have a graphic of some slime I want to add to a wall. The wall is a simple 1024 X 1024 graphic of bricks.
Here is the slime with an .png Alpha channel.
It looks great as a stand alone ( I checked ) and is transparent, but how do apply it to the brickwork texture so it looks like its running down the walls.
Thanks
Dicon

New drips.png1024×1024 48.1 KB

2

Cycles or internal?

3

Steve, I’m using Blenders internal as I am just starting out with my Blender for Dummies in one hand and coffee in the other. I did work in the past as a professional artist for various companies but not 3D so I know what I want, but not how to get it. I’m not ready to tackle cycles yet.
IYSWIM
Thanks
Dicon

4

In your textures tab, add the wall texture, and then the slime texture (below it).

Here the settings for the slime texture:
In the «Image panel», check ‘use alpha’
In the «Image Sampling» panel, under ‘Alpha’, check ‘use’
In «Influence» uncheck ‘RGB to Intensity’, and also the ‘Alpha’ influence.

It should work now.

5

Thanks all, GREAT! it does work, good for adding things like posters and graffiti. I was thinking of a sort of stain that I could use to add grunge and, in the case of slime or drips to see through to the underlying graphics. Or is this asking too much from the renderer? I can work around it by tweaking the artwork of the brick in a drawing package but the ability to vary the grottiness of the material would stop the pattern repeat kind of effect over a large area.
Thanks
Dicon
( who always bites off more than he can chew )

6

Don’t worry about over-taxing the renderer. Do what you need to make it look like you want… then bake the textures. That flattens all the images and let you save out a single texture.

7

I was thinking of a sort of stain that I could use to add grunge and, in the case of slime or drips to see through to the underlying graphics
Set the influence of the grunge texture to <1 to see the underlying brick texture

What are you exactly trying to do ? Show us

8

This was the effect I was after, I did what was recommended and, as you can see it came out OK
It would be nice if there wasn’t the black edge to the drips, but I can live with that. I’m aiming for a dark Dickensian London, very moody and lit with gas lamps.
Thanks all for the advice.
Dicon

9

Thanks all for the advice. I got the correct result I needed by changing my graphics package to Corel Draw.
Dicon