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Add support for orthographic rendering #157

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Merged
merged 1 commit into from
Sep 11, 2025
+18 −8
Merged

Add support for orthographic rendering #157

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26 changes: 18 additions & 8 deletions src/shaders/splatVertex.glsl
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Original file line number Diff line number Diff line change
Expand Up @@ -131,14 +131,24 @@ void main() {
// Compute the Jacobian of the splat's projection at its center
vec2 scaledRenderSize = renderSize * focalAdjustment;
vec2 focal = 0.5 * scaledRenderSize * vec2(projectionMatrix[0][0], projectionMatrix[1][1]);
float invZ = 1.0 / viewCenter.z;
vec2 J1 = focal * invZ;
vec2 J2 = -(J1 * viewCenter.xy) * invZ;
mat3 J = mat3(
J1.x, 0.0, J2.x,
0.0, J1.y, J2.y,
0.0, 0.0, 0.0
);

mat3 J;
if(isOrthographic) {
J = mat3(
focal.x, 0.0, 0.0,
0.0, focal.y, 0.0,
0.0, 0.0, 0.0
);
} else {
float invZ = 1.0 / viewCenter.z;
vec2 J1 = focal * invZ;
vec2 J2 = -(J1 * viewCenter.xy) * invZ;
J = mat3(
J1.x, 0.0, J2.x,
0.0, J1.y, J2.y,
0.0, 0.0, 0.0
);
}

// Compute the 2D covariance by projecting the 3D covariance
// and picking out the XY plane components.
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