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API > API/Runtime > API/Runtime/Engine > API/Runtime/Engine/Materials
Inheritance Hierarchy
- UObjectBase
- UObjectBaseUtility
- UObject
- UMaterialExpression
- UMaterialExpressionSkyAtmosphereLightIlluminance
References
| Module | Engine |
| Header | /Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionSkyAtmosphereLightIlluminance.h |
| Include | #include "Materials/MaterialExpressionSkyAtmosphereLightIlluminance.h" |
Syntax
UCLASS ()
class UMaterialExpressionSkyAtmosphereLightIlluminance : public UMaterialExpression
Variables
| Type | Name | Description | |
|---|---|---|---|
    |
int32 | LightIndex | Index of the atmosphere light to sample. |
  |
FExpressionInput | WorldPosition | World position of the sample. If not specified, the pixel world position will be used. |
   |
EPositionOrigin | WorldPositionOriginType | Defines the reference space for the WorldPosition input. |
Constructors
| Type | Name | Description | |
|---|---|---|---|
 |
UMaterialExpressionSkyAtmosphereLightIlluminance
(
const FObjectInitializer& ObjectInitializer |
Overridden from UMaterialExpression
| Type | Name | Description | |
|---|---|---|---|
  |
int32 | Compile
(
FMaterialCompiler* Compiler, |
Create the new shader code chunk needed for the Abs expression |
   |
bool | GenerateHLSLExpression
(
FMaterialHLSLGenerator& Generator, |
|
   |
void | GetCaption
(
TArray< FString >& OutCaptions |
Returns the text to display on the material expression (in the material editor). |
  |
void | GetExpressionToolTip
(
TArray< FString >& OutToolTip |
Get a tooltip for the expression itself. |
   |
FName | GetInputName
(
int32 InputIndex |
Overridden from UObject
| Type | Name | Description | |
|---|---|---|---|
  |
void | PostEditChangeProperty
(
FPropertyChangedEvent& PropertyChangedEvent |
Called when a property on this object has been modified externally |