Hi, I’m new to Defold and I’m making a platform game mixed with shooter. The main character of my game for some reason, is crossing the ground, even with a collision
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Hi! This might be addressing your issue: https://defold.com/manuals/physics/#resolving-kinematic-collisions
If that doesn’t help, could you provide a minimal project or at least some snippets where you’re having the issues?
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So, I did what the tutorial said, but still the character crosses the floor
Player collision
Floor collision
Did you assign collision groups in the .tilesource file?
When you use a tilesource you can hav multiple collision groups. In your screenshot you have assigned some tiles to the group “default”. The group setting in the collision properties (where you have set “floor”) is ignored and the groups in the tilesource are the ones that are used. Mentioned here:
Check this example:
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Double check everything, then share your project (exclude build and .git folder) here or directly with me (bjorn@defold.se).
Is there any code to make the character collide with the floor?
Yes, you need code to resolve the collision between the floor and your player. You should have a script attached to the player character with the code required to resolve the collision. That is what Alesis mentioned in his reply to you:
Here is a complete template project for a platformer game in Defold: https://github.com/defold/template-platformer
So, I copied the player’s script and modified it a little:
local air_acceleration_factor = 0.8
local max_speed = 450
local gravity = -1900
local jump_takeoff_speed = 1200
local msg_contact_point_response = hash(“contact_point_response”)
local msg_animation_done = hash(“animation_done”)
local group_obstacle = hash(“floor”)
local input_left = hash(“Left”)
local input_right = hash(“Right”)
local input_jump = hash(“jump”)
local anim_idle = hash(“idle”)
local anim_fall = hash(“fall”)
function init(self)
msg.post(".", “acquire_input_focus”)
msg.post(“camera”, “acquire_camera_focus”)
self.velocity = vmath.vector3(0, 0, 0)
self.correction = vmath.vector3()
self.ground_contact = false
self.anim = nil
end
local function play_animation(self, anim)
if self.anim ~= anim then
msg.post("#sprite", “play_animation”, {id = anim})
self.anim = anim
end
end
local function update_animations(self)
sprite.set_hflip("#sprite", self.velocity.x < 0)
if self.ground_contact then
if self.velocity.x == 0 then
play_animation(self, anim_idle)
else
play_animation(self, anim_walk)
end
else
if self.velocity.y > 0 then
play_animation(self, anim_jump)
else
play_animation(self, anim_fall)
end
end
end
function update(self, dt)
self.velocity.y = self.velocity.y + gravity * dt
local pos = go.get_position()
pos = pos + self.velocity * dt
go.set_position(pos)
update_animations(self)
self.correction = vmath.vector3()
self.ground_contact = false
self.wall_contact = false
end
local function handle_obstacle_contact(self, normal, distance)
if distance > 0 then
local proj = vmath.project(self.correction, normal * distance)
if proj < 1 then
local comp = (distance - distance proj) normal
go.set_position(go.get_position() + comp)
self.correction = self.correction + comp
end
end
if math.abs(normal.x) > 0.7 then
self.wall_contact = true
self.velocity.x = 0
end
if normal.y > 0.7 then
self.ground_contact = true
self.velocity.y = 0
end
if normal.y < -0.7 then
self.velocity.y = 0
end
end
function on_message(self, message_id, message, sender)
if message_id == msg_contact_point_response then
if message.group == group_obstacle then
handle_obstacle_contact(self, message.normal, message.distance)
end
end
end
local function jump(self)
if self.ground_contact then
self.velocity.y = jump_takeoff_speed
play_animation(self, anim_jump)
self.ground_contact = false
end
end
local function abort_jump(self)
if self.velocity.y > 0 then
self.velocity.y = self.velocity.y * 0.5
end
end
local function walk(self, direction)
if self.ground_contact then
self.velocity.x = max_speed * direction
else
self.velocity.x = max_speed air_acceleration_factor direction
end
end
function on_input(self, action_id, action)
if action_id == input_left then
walk(self, -action.value)
elseif action_id == input_right then
walk(self, action.value)
elseif action_id == input_jump then
if action.pressed then
jump(self)
elseif action.released then
abort_jump(self)
end
end
end
Ok, so you got everything working now?
Did you try the template project as a whole? And did you compare your project to the template project?
My offer remains to help you if you share a copy of your project.
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How?
Could you please specify in more detail what you did? I have this same issue.