13 and 16 after we have moved the relative map to where we were interested in fig. For precise results it is necessary to go to UV Editing and move or resize the vertices corresponding to the face we are interested in obtaining compare fig. Remember that the material associated with Black is the first in the MixShader while the one at the bottom the 2nd is associated with White. 13: the materials split exactly as in the black and white figure (they are no longer fused) and that's what we wanted to achieve. Once this is done, let's notice what happened to our cube fig. Now let's go back to the Shading and connect the Color node of the image to the Fac (Factor) node of the MixShader fig.12. If this is not the case, we must provide it by pressing the U key and choosing from the Unwrap menu or the item we need best.

Then we proceed by going to the UV Editing workspace but we discover that the mapping has already been done by Blender automatically fig. The first time we use textures we have to Unwrap our object to allow the image to be allocated on 2D coordinates (as if we were unwrapping a candy and unfolding the paper that corresponds to the image texture). Drag the file from the folder where it resides and the Image Texture node is automatically created with the file path already complete. Previously I prepared a small black and white image of 100 x 100 pixels which I called mask_tratto.jpg. We note that Blender has merged the two colors into a purple but our goal is to separate the two colors and have them at the same time but on different parts. I load a MixShader to which I connect the previous Diffuses. I duplicate the Diffuse and change both colors to Blue and Red respectively fig.

We select it and go to the Shading workspace to assign a material, here he proposes the Principle bsdf, but I prefer to delete it and use a simple Diffuse in its place. We open a new Blender file and it offers us the default cube let's leave it as well. We create an image with a black background and then draw the shape we are interested in in white. How to use two different shaders or textures on the same object in a controlled way? To use different Materials, Shaders or textures on the same object, we use a mask that is an image (jpg file) in black and white that acts as a discriminant of the materials. Two different textures on the same object using an image mask.

Blender 2.8 materials