Documentation

Unity Engine

User Manual

Script Reference

Unity Engine

Apply(bool, bool)

Copies changes you've made in a CPU texture to the GPU.
Read time 1 minuteLast updated 4 days ago

Definition

  • Type: Method
  • Namespace: UnityEngine
  • Assembly: UnityEngine.CoreModule
public void Apply(bool updateMipmaps, bool makeNoLongerReadable)

Parameters

updateMipmaps

bool
When the value is 
true
, Unity recalculates mipmap levels, using mipmap level 0 as the source. The default value is 
true
.

makeNoLongerReadable

bool
When the value is 
true
, Unity deletes the texture in CPU memory after it uploads it to the GPU, and sets isReadable to 
false
. The default value is 
false
.

Remarks

For most types of textures, Unity can store a copy of the texture in both CPU and GPU memory.
The CPU copy is optional. If the CPU copy exists, you can read from and write to the CPU copy more flexibly than the GPU copy, for example using Texture3D.GetPixels. But to render the updated texture, you must use 
Apply
to copy it from the CPU to the GPU.
If you set 
makeNoLongerReadable
to 
true
, Unity deletes the CPU copy of the texture after it uploads it to the GPU.
You usually only set 
updateMipmaps
to 
false
if you've already updated the mipmap levels, for example using Texture3D.SetPixels.
Apply
is an expensive operation because it copies all the pixels in the texture even if you've only changed some of the pixels, so change as many pixels as possible before you call it.