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Addition of Near and Far Z-Axis Camera Planes #21

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Addition of Near and Far Z-Axis Camera Planes #21

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16 changes: 16 additions & 0 deletions addons/ShaderFunction-Extras/Utility/utility.gdshaderinc
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Original file line number Diff line number Diff line change
Expand Up @@ -137,3 +137,19 @@ vec3 vertex_billboard(vec2 uv, mat4 view_mat, vec3 vertex, float scale) {
uv *= scale;
return vert + ((vec4(uv, 0.0, 0.0) * view_mat)).xyz;
}

float camera_z_near_plane_vulkan(mat4 proj_mat) {
return abs(proj_mat[3][2] / proj_mat[2][2]);
}

float camera_z_near_plane_gles(mat4 proj_mat) {
return proj_mat[3][2] / (proj_mat[2][2] - 1.0);
}

float camera_z_far_plane_vulkan(mat4 proj_mat) {
return abs((proj_mat[3][2] * camera_z_near_plane(mat4 proj_mat)) / (proj_mat[3][2] + camera_z_near_plane(mat4 proj_mat)));
}

float camera_z_far_plane_gles(mat4 proj_mat) {
return proj_mat[3][2] / (proj_mat[2][2] + 1.0);
}