gl_Vertex

gl_Vertex

Valid Programs: *.vsh

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The vertex position attribute in model space (which varies for different geometry). It can be converted to view space using gl_ModelViewMatrix

vec3 model_pos = gl_Vertex.xyz;
vec4 view_pos = gl_ModelViewMatrix * vec4(model_pos, 1.0);
vec4 clip_pos = gl_ProjectionMatrix * view_pos;

gl_Position = clip_pos;

in vec3 vaPosition;

Danger

This attribute only works with the core profile in Minecraft 1.17 and newer. It is recommended to use the compatibility profile with Iris for better support. See this page for more information.

For terrain this is relative to the chunk and you must add chunkOffset as shown below. For all other geometry, vaPosition directly stores the model space position. It can be converted to view space using modelViewMatrix

vec3 model_pos = vaPosition + chunkOffset;
vec4 view_pos = modelViewMatrix * vec4(model_pos, 1.0);
vec4 clip_pos = projectionMatrix * view_pos;

gl_Position = clip_pos;