Fix to blender contrast being inverted in Starfield material data

CHANGELOG.md

@@ -3,6 +3,7 @@
 * Added new spell (Batch/Copy and Rename all Meshes) by 1OfAKindMods to copy and rename all .mesh files used by a Starfield model. Note that the spell expects a loose NIF file, if the model is from an archive, the renamed mesh files are written under the NifSkope installation directory.
 * The right click menu on header strings that end with .bgsm, .bgem or .mat has a new option to browse materials. Updating the view (Alt+U) may be needed for material path changes to take effect.
 * Added limited support for rendering translucent Starfield materials.
+* Fixed the contrast parameter of Starfield blenders that is inverted in the material data.
 * The default height scale for Starfield parallax occlusion mapping is now 0.0 in the render settings, as height textures do not actually work in the game.
 
 #### NifSkope-2.0.dev9-20240616

res/shaders/stf_default.frag

@@ -502,7 +502,7 @@ void main()
 				if ( lm.blenders[i - 1].blendMode == 2 ) {
 					float	blendPosition = lm.blenders[i - 1].floatParams[2];
 					float	blendContrast = lm.blenders[i - 1].floatParams[3];
-					blendContrast = max( (1.0 - blendContrast) * min(blendPosition, 1.0 - blendPosition), 0.001 );
+					blendContrast = max( blendContrast * min(blendPosition, 1.0 - blendPosition), 0.001 );
 					blendPosition = ( blendPosition - 0.5 ) * 3.17;
 					blendPosition = ( blendPosition * blendPosition + 1.0 ) * blendPosition + 0.5;
 					float	maskMin = blendPosition - blendContrast;

src/model/nifextfiles.cpp

@@ -85,7 +85,7 @@ void NifModel::loadSFBlender( NifItem * parent, const void * o )
 		setValue<float>( parent, "Height Blend Threshold", floatParams[0] );
 		setValue<float>( parent, "Height Blend Factor", floatParams[1] );
 		setValue<float>( parent, "Position", floatParams[2] );
-		setValue<float>( parent, "Contrast", floatParams[3] );
+		setValue<float>( parent, "Contrast", 1.0f - floatParams[3] );
 		setValue<float>( parent, "Mask Intensity", floatParams[4] );
 		setValue<bool>( parent, "Blend Color", boolParams[0] );
 		setValue<bool>( parent, "Blend Metalness", boolParams[1] );