Shadowlight v Tilemap render bug

Problem Description

Tilemaps with shadowcaster behavior cast incorrect shadows with artifacts.

Attach a Capx

capx

Description of Capx

Simple tilemap with solid and shadowcaster behaviours. The shadowlight object and glow/mask object are both moved to a player sprite that can be moved using the platform behaviour. The shadowlight height is set to zero and should cast long shadows.

Steps to Reproduce Bug

• Run Layout and move player around the platforms.
• Observe the limit to the cast shadow.

Observed Result

Example showing the end of a cast shadow, as if the height of the light source was not zero:

Expected Result

Tilemaps do not cast shadows with artifacts.

Affected Browsers

• Chrome: (YES)
• FireFox: (YES)
• Internet Explorer: (YES)

Operating System and Service Pack

W10 x64.

Construct 2 Version ID

r229 64 bit.

Closing as won't fix: see the manual entry's advice -

[quote:2aozn49i]When using a light radius, avoid placing the light very close to or directly over a shadow caster. Shadows can fail to render correctly in these circumstances.

The maths and algorithms behind shadow casting with a radius are pretty complex and radius-based lights very close to a caster is an extreme case requiring almost-infinite projection. The projection isn't actually infinite which can cause artefacts like this.

Shame - I'll have to limit my use to a light radius of zero. Thanks for checking.