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Updated documentation for use of generated normals.

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James.Hester 2020-06-18 22:29:49 +10:00 committed by James Turner
parent 98eaa7de89
commit ed0969c184
1 changed files with 6 additions and 4 deletions
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10
Docs/README.effects
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@ -268,7 +268,7 @@ Often shader effects need tangent vectors to work properly. These
tangent vectors, usually called tangent and binormal, are computed tangent vectors, usually called tangent and binormal, are computed
on the CPU and given to the shader as vertex attributes. These on the CPU and given to the shader as vertex attributes. These
vectors are computed on demand on the geometry using the effect if vectors are computed on demand on the geometry using the effect if
the 'generate' clause is present in the effect file. Exemple : the 'generate' clause is present in the effect file. Example :
<generate> <generate>
<tangent type="int">6</tangent> <tangent type="int">6</tangent>
@ -277,8 +277,10 @@ the 'generate' clause is present in the effect file. Exemple :
</generate> </generate>
Valid subnodes of 'generate' are 'tangent', 'binormal' or 'normal'. Valid subnodes of 'generate' are 'tangent', 'binormal' or 'normal'.
The integer value of these subnode is the index of the attribute The integer value of these subnodes is the index of the attribute
that will hold the value of the vec3 vector. that will hold the value of the vec3 vector. If 'normal' generation
is requested, the generated normals will replace those supplied by
the model or terrain, which is usually undesirable.
The generate clause is located under PropertyList in the xml file. The generate clause is located under PropertyList in the xml file.
@ -297,7 +299,7 @@ be bound to an attribute in the program clause, like this :
</attribute> </attribute>
</program> </program>
attribute names are whatever the shader use. The index is the one attribute names are whatever the shader uses. The index is the one
declared in the 'generate' clause. So because generate/tangent has declared in the 'generate' clause. So because generate/tangent has
value 6 and my_tangent_attribute has index 6, my_tangent_attribute value 6 and my_tangent_attribute has index 6, my_tangent_attribute
holds the tangent value for the vertex. holds the tangent value for the vertex.