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Corrected scale of planet shadows on rings.

pull/3/head
Chris Laurel 2001-05-03 00:59:27 +00:00
parent 873c061f75
commit e68d253a01
1 changed files with 8 additions and 7 deletions
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15
src/render.cpp
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@ -1397,16 +1397,17 @@ void Renderer::renderPlanet(const Body& body,
float sPlane[4] = { 0, 0, 0, 0.5f };
float tPlane[4] = { 0, 0, 0, 0.5f };
// Compute the projection vectors based on the sun direction.
// I'm being a little careless here--if the sun direction lies
// along the y-axis, this will fail. It's unlikely that a planet
// would ever orbit underneath its sun (an orbital inclination of
// 90 degrees), but this should be made more robust anyway.
// Compute the projection vectors based on the sun direction.
// I'm being a little careless here--if the sun direction lies
// along the y-axis, this will fail. It's unlikely that a planet
// would ever orbit underneath its sun (an orbital inclination of
// 90 degrees), but this should be made more robust anyway.
float scale = rings->innerRadius / body.getRadius();
Vec3f axis = Vec3f(0, 1, 0) ^ localSunDir;
float angle = (float) acos(Vec3f(0, 1, 0) * localSunDir);
Mat4f mat = Mat4f::rotation(axis, -angle);
Vec3f sAxis = Vec3f(0.5f, 0, 0) * mat;
Vec3f tAxis = Vec3f(0, 0, 0.5f) * mat;
Vec3f sAxis = Vec3f(0.5f * scale, 0, 0) * mat;
Vec3f tAxis = Vec3f(0, 0, 0.5f * scale) * mat;
sPlane[0] = sAxis.x; sPlane[1] = sAxis.y; sPlane[2] = sAxis.z;
tPlane[0] = tAxis.x; tPlane[1] = tAxis.y; tPlane[2] = tAxis.z;