improve the json to match dispersion spec

KhronosGroup · Nov 13, 2023 · 238a23b · 238a23b
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diff --git a/extensions/2.0/Khronos/KHR_materials_dispersion/README.md b/extensions/2.0/Khronos/KHR_materials_dispersion/README.md
@@ -33,7 +33,7 @@ The Abbe number \( $V$ \) is computed from the index of refraction at three wave
 
 $$V = \frac{n_d - 1}{n_F - n_C}$$
 
-To calculate the index of refraction at a specific wavelength \( $\lambda$ \), given an Abbe number \( $V$ \) and the central index of refraction (assumed to be at the central wavelength, \( $N_d$ \), as specified by the KHR_materials_ior extension):
+To calculate the index of refraction at a specific wavelength \( $\lambda$ \), given an Abbe number \( $V$ \) and the central index of refraction as specified by the KHR_materials_ior extension (assumed to be at the central wavelength, \( $N_d$ \)):
 
 $$
 B = \frac{n_d - 1}{V \left( {\lambda_F^{-2}} - {\lambda_C^{-2}} \right)}
@@ -79,7 +79,7 @@ Factor and texture are combined by multiplication to describe a single value.
 |-|----|-----------|--------|
 | **dispersion** | `number` | The strength of the dispersion effect, specified as 20/Abbe number. | No, default: `0`|
 
-The default value of 0 has a special meaning in that no dispersion should be used.  This is the default value for backwards compatibility.  Any value in the valid range [0, 100] other than zero is considered to be a valid dispersion value, although the range between [0 , 1] is the range of realistic values.
+The default value of 0 has a special meaning in that no dispersion should be used.  This is the default value for backwards compatibility.  Any value zero or larger is considered to be a valid dispersion value, although the range between [0 , 1] is the range of realistic values.
 
 Here is a table of some material dispersion Abbe numbers, including the outlier of Rutile which is a very high dispersion material:
 

diff --git a/...2.0/Khronos/KHR_materials_dispersion/schema/material.KHR_materials_dispersion.schema.json b/...2.0/Khronos/KHR_materials_dispersion/schema/material.KHR_materials_dispersion.schema.json
@@ -9,9 +9,8 @@
             "type": "number",
             "description": "The strength of the dispersion.",
             "default": 0.0,
-            "minimum": 1.0,
-            "maximum": 1000.0,
-            "gltf_detailedDescription": "This parameter defines dispersion in terms of the Abby number formulation."
+            "minimum": 0.0,
+            "gltf_detailedDescription": "This parameter defines dispersion in terms of the 20/Abbe number formulation."
         },
         "extensions": { },
         "extras": { }