I want to use Plane3D tool to make material, alpha displace > and then grab displaced plane with mat as a texture problem is if I create plane it won’t match my texture size I need to resize it later.
Is it possible to create canvas for example 4096x4096 and then fill it fully with 3D plane tool, so when I displace alpha and grab material as a texture it will match my UV map perfectly ?
I’m not really understanding the need to do this. To get things to match, what you need to do is divide the plane to have as many polys as the texture has pixels. For a 4K texture that means about 10-12 million polys. Anything you sculpt or paint onto the plane will exactly match your texture size.
If you really do want your plane size to match your canvas that can be done. After drawing the model on the canvas, activate the Gyro. While in Move mode use the Transform>Info sliders to position the model in the center of the canvas. Then switch to Scale mode and use those same sliders to set the X and Y values to half your canvas size. Your plane will now be centered on and perfectly match the size of the canvas. Good luck interacting with it very well, though – the real-time rendering engine is going to have a tough time editing a model drawn to that scale.