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Allow for manually setting miter or bevel joints

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This commit is contained in:
Grant Sanderson 2024-08-07 14:45:55 -05:00
parent bc91e91634
commit f677a02036
1 changed files with 7 additions and 4 deletions
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11
manimlib/shaders/quadratic_bezier_stroke/geom.glsl
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@ -112,11 +112,14 @@ vec3 step_to_corner(vec3 point, vec3 tangent, vec3 unit_normal, vec4 joint_produ
} }
// Adjust based on the joint. // Adjust based on the joint.
// Bevel for cos(angle) > -0.7, smoothly transition // If joint type is auto, it will bevel for cos(angle) > -0.7,
// to miter for those with sharper angles // and smoothly transition to miter for those with sharper angles
float miter_factor;
if (joint_type == AUTO_JOINT) miter_factor = smoothstep(-0.7, -0.9, cos_angle);
else if (joint_type == BEVEL_JOINT) miter_factor = 0.0;
else miter_factor = 1.0;
float sin_angle = sqrt(1 - cos_angle * cos_angle) * sign(dot(joint_product.xyz, unit_normal)); float sin_angle = sqrt(1 - cos_angle * cos_angle) * sign(dot(joint_product.xyz, unit_normal));
float miter_factor = (int(joint_type) == MITER_JOINT) ?
1.0 : smoothstep(-0.7, -0.9, cos_angle);
float shift = (cos_angle + mix(-1, 1, miter_factor)) / sin_angle; float shift = (cos_angle + mix(-1, 1, miter_factor)) / sin_angle;
return step + shift * unit_tan; return step + shift * unit_tan;