I'm trying to create a 3D first-person game which could run in browser using webGL technology. I have generated a landscape with Blender and now I'm bothering with textures. In my game I scale Blender's landscape in 1500 times to achieve large world but with this approach I can't use single texture file for all this world. So i was drop into technique called texture splatting. As result I wrote a shader that combine 4 textures in one using texture map file which look similar to this:
4 RGBA channels in this image set's the intensity of 4 textures. Here is how it works - https://www.youtube.com/watch?v=JMaaumAB_Rg&feature=youtu.be
Now I want to find a way to genereate that texture map. I would like to be able to draw in in blender on landscape mesh. I was following steps in this video https://vimeo.com/15679785 but having problems with it a here is where I need help.
I'm adding dirt texture as basic texture, then I'm adding new texture of type image or movie but I select new to create new image. I deselect influence->diffuse->color and check influence->stencil and influence->rgb to intensity for this texture. Then I'm adding grass texture and expecting then drawing on landscape mesh in texture paint mode will
reflect in changes in texture map layer and will bring a grass on mesh. But when I drawing it only change dirt texture and has no any effect on texture which is supposed to be texture map. What am I'm doing wrong here?
Here are screenshots of texture settings I'm using:
