First, prepare a png picture to paste, one png and one black and white. Please note that the graphics displayed here are white, and the graphics that are not displayed are black. (as shown in the figure below)

Then set up a simple scene. Here, for convenience, I just make a cube, add Arnold parameter labels to the cube, and uncheck opaque under Arnold parameter labels. If you don't cancel, you can try it yourself and see what effect it has-w-.

Then create a new Arnold material ball, give it to the cube, open the Arnold material editor, and drag in two prepared pictures, in which the png picture connects colors, and the black and white picture connects geometry-trimming transparency. Here, I built a ground and gave it a blue material, which is more intuitive. Now we can see that the cube is gone, only the pasted picture can be seen. Then someone said, what if I want to display the original materials in a cube and then post a picture of this pattern? This is a way to brand many products. Let me also talk about it.

Next, create a new Arnold material. Here is a wood grain material, so I won't elaborate on how to do it. Give the wood grain material to the cube, and then we find that the wood grain material covers our original texture material What should we do?

First, replace the position of the texture material and the wooden material label, so that the texture material label is behind, then click the texture material, select alpha, change the mode to the material, and select our previous black and white texture. At this time, you will find that our texture is perfectly displayed on the wood grain.

The above is the method of transparent png image mapping for C4D Arnold renderer ~

Using this method, we can also give people tattoos, as shown in the figure, create a new doll, c remove it, select a face of the doll's upper body in face mode, give it a good texture, cancel the tiling under the material label, and then adjust the UV parameters according to the actual effect to get a tattoo effect.

With this idea, we can also do luminous tattoos and other effects, as shown in the figure, connect the black and white map to the self-luminous-weight, and change the color of the luminous tattoo by adjusting the color of the self-luminous.